Add vim-modeline to render files as POD

GitHub (also) checks the vim-modeline to decide how the file should
be rendered.

These files are all in the POD format so add the vim-modeline so that
GitHub displays them in a formatted way.

(Note: adding `linguist-language=Pod` in .gitattributes does not work,
 I created a GH support ticket for that a month ago but there have
 been little progress on it.)

Author: Bram

Diff for: Cross/README.new

@@ -1,3 +1,5 @@
+# vim: syntax=pod
+
 You're reading ./Cross/README.new, describing Perl cross-compilation process.
 NOTE: this file will replace ./Cross/README, after the cross-compilation scheme
 is stabilized.

Diff for: INSTALL

@@ -1,3 +1,5 @@
+# vim: syntax=pod
+
 If you read this file _as_is_, just ignore the funny characters you see.
 It is written in the POD format (see F<pod/perlpod.pod>) which is specially
 designed to be readable as is.

Diff for: PACKAGING

@@ -1,3 +1,5 @@
+# vim: syntax=pod
+
 If you read this file _as_is_, just ignore the funny characters you
 see.  It is written in the POD format (see pod/perlpod.pod) which is
 specifically designed to be readable as is.

Diff for: README.aix

@@ -1,3 +1,5 @@
+# vim: syntax=pod
+
 If you read this file _as_is_, just ignore the funny characters you see.
 It is written in the POD format (see pod/perlpod.pod) which is specially
 designed to be readable as is.

Diff for: README.amiga

@@ -1,3 +1,5 @@
+# vim: syntax=pod
+
 If you read this file _as_is_, just ignore the funny characters you
 see. It is written in the POD format (see perlpod manpage) which is
 specially designed to be readable as is.

Diff for: README.android

@@ -1,3 +1,5 @@
+# vim: syntax=pod
+
 If you read this file _as_is_, just ignore the funny characters you
 see. It is written in the POD format (see pod/perlpod.pod) which is
 specially designed to be readable as is.

Diff for: README.bs2000

@@ -1,3 +1,5 @@
+# vim: syntax=pod
+
 This document is written in pod format hence there are punctuation
 characters in odd places.  Do not worry, you've apparently got the
 ASCII->EBCDIC translation worked out correctly.  You can read more

Diff for: README.cn

@@ -1,3 +1,5 @@
+# vim: syntax=pod
+
 如果你用一般的文字编辑器阅览这份文件, 请忽略文中奇特的注记字符.
 这份文件是以 POD (简明文件格式) 写成; 这种格式是为了能让人直接阅读,
 而特别设计的. 关于此格式的进一步信息, 请参考 perlpod 在线文档.

Diff for: README.cygwin

@@ -1,3 +1,5 @@
+# vim: syntax=pod
+
 If you read this file _as_is_, just ignore the funny characters you
 see. It is written in the POD format (see F<pod/perlpod.pod>) which is
 specially designed to be readable as is.

Diff for: README.freebsd

@@ -1,3 +1,5 @@
+# vim: syntax=pod
+
 If you read this file _as_is_, just ignore the funny characters you
 see.  It is written in the POD format (see pod/perlpod.pod) which is
 specifically designed to be readable as is.

Diff for: README.haiku

@@ -1,3 +1,5 @@
+# vim: syntax=pod
+
 If you read this file _as_is_, just ignore the funny characters you see.
 It is written in the POD format (see pod/perlpod.pod) which is specially
 designed to be readable as is.

Diff for: README.hpux

@@ -1,3 +1,5 @@
+# vim: syntax=pod
+
 If you read this file _as_is_, just ignore the funny characters you see.
 It is written in the POD format (see pod/perlpod.pod) which is specially
 designed to be readable as is.

Diff for: README.hurd

@@ -1,3 +1,5 @@
+# vim: syntax=pod
+
 If you read this file _as_is_, just ignore the funny characters you see.
 It is written in the POD format (see pod/perlpod.pod) which is specially
 designed to be readable as is.

Diff for: README.irix

@@ -1,3 +1,5 @@
+# vim: syntax=pod
+
 If you read this file _as_is_, just ignore the funny characters you
 see.  It is written in the POD format (see pod/perlpod.pod) which is
 specifically designed to be readable as is.

Diff for: README.jp

@@ -1,3 +1,5 @@
+# vim: syntax=pod
+
 =encoding utf8
 
 =head1 NAME

Diff for: README.ko

@@ -1,3 +1,5 @@
+# vim: syntax=pod
+
 이 파일을 내용 그대로 읽고 있다면 우스꽝스러운 문자는 무시해주세요.
 이 문서는 POD로 읽을 수 있도록 POD 형식(F<pod/perlpod.pod> 문서를
 확인하세요)으로 작성되어 있습니다.

Diff for: README.linux

@@ -1,3 +1,5 @@
+# vim: syntax=pod
+
 If you read this file _as_is_, just ignore the funny characters you
 see.  It is written in the POD format (see pod/perlpod.pod) which is
 specifically designed to be readable as is.

Diff for: README.macosx

@@ -1,3 +1,5 @@
+# vim: syntax=pod
+
 If you read this file _as_is_, just ignore the funny characters you see.
 It is written in the POD format (see pod/perlpod.pod) which is specially
 designed to be readable as is.

Diff for: README.openbsd

@@ -1,3 +1,5 @@
+# vim: syntax=pod
+
 If you read this file _as_is_, just ignore the funny characters you
 see.  It is written in the POD format (see pod/perlpod.pod) which is
 specifically designed to be readable as is.

Diff for: README.os2

@@ -1,3 +1,5 @@
+# vim: syntax=pod
+
 If you read this file _as_is_, just ignore the funny characters you
 see. It is written in the POD format (see perlpod manpage) which is
 specially designed to be readable as is.

Diff for: README.os390

@@ -1,3 +1,5 @@
+# vim: syntax=pod
+
 This document is written in pod format hence there are punctuation
 characters in odd places. You can read more
 about pod in pod/perlpod.pod or the short summary in the INSTALL file.

Diff for: README.os400

@@ -1,3 +1,5 @@
+# vim: syntax=pod
+
 If you read this file _as_is_, just ignore the funny characters you see.
 It is written in the POD format (see pod/perlpod.pod) which is specially
 designed to be readable as is.

Diff for: README.plan9

@@ -1,3 +1,5 @@
+# vim: syntax=pod
+
 If you read this file _as_is_, just ignore the funny characters you see.
 It is written in the POD format (see pod/perlpod.pod) which is specially
 designed to be readable as is.

Diff for: README.qnx

@@ -1,3 +1,5 @@
+# vim: syntax=pod
+
 If you read this file _as_is_, just ignore the funny characters you see.
 It is written in the POD format (see pod/perlpod.pod) which is specially
 designed to be readable as is.

Diff for: README.riscos

@@ -1,3 +1,5 @@
+# vim: syntax=pod
+
 If you read this file _as_is_, just ignore the funny characters you
 see.  It is written in the POD format (see pod/perlpod.pod) which is
 specifically designed to be readable as is.

Diff for: README.solaris

@@ -1,3 +1,5 @@
+# vim: syntax=pod
+
 If you read this file _as_is_, just ignore the funny characters you
 see.  It is written in the POD format (see pod/perlpod.pod) which is
 specifically designed to be readable as is.

Diff for: README.synology

@@ -1,3 +1,5 @@
+# vim: syntax=pod
+
 If you read this file _as_is_, just ignore the funny characters you see.
 It is written in the POD format (see pod/perlpod.pod) which is specially
 designed to be readable as is. But if you have been into Perl you

Diff for: README.tru64

@@ -1,3 +1,5 @@
+# vim: syntax=pod
+
 If you read this file _as_is_, just ignore the funny characters you see.
 It is written in the POD format (see pod/perlpod.pod) which is specially
 designed to be readable as is.

Diff for: README.tw

@@ -1,3 +1,5 @@
+# vim: syntax=pod
+
 如果你用一般的文字編輯器閱覽這份文件, 請忽略文中奇特的註記字符.
 這份文件是以 POD (簡明文件格式) 寫成; 這種格式是為了能讓人直接讀取,
 而特別設計的. 關於此格式的進一步資訊, 請參考 perlpod 線上文件.

Diff for: README.vms

@@ -1,3 +1,5 @@
+# vim: syntax=pod
+
 If you read this file _as_is_, just ignore the equal signs on the left.
 This file is written in the POD format (see [.pod]perlpod.pod) which is
 specially designed to be readable as is.

Diff for: README.vos

@@ -1,3 +1,5 @@
+# vim: syntax=pod
+
 If you read this file _as_is_, just ignore the funny characters you
 see. It is written in the POD format (see pod/perlpod.pod) which is
 specially designed to be readable as is.

Diff for: README.win32

@@ -1,3 +1,5 @@
+# vim: syntax=pod
+
 If you read this file _as_is_, just ignore the funny characters you
 see. It is written in the POD format (see pod/perlpod.pod) which is
 specially designed to be readable as is.

Diff for: hints/README.hints

@@ -1,3 +1,5 @@
+# vim: syntax=pod
+
 =head1 NAME
 
 README.hints - hint files used by Configure