Add .editorconfig to make files look good on GitHub

.editorconfig

@@ -0,0 +1,22 @@
+
+
+# top-most EditorConfig file
+root = true
+
+# Unix-style newlines with a newline ending every file
+[*]
+end_of_line = lf
+insert_final_newline = true
+
+# Matches multiple files with brace expansion notation
+# Set default charset
+[*]
+charset = utf-8
+
+[*.{cpp,h,qml,json,md}]
+indent_style = tab
+indent_size = 4
+
+[*.R]
+indent_style = space
+indent_size = 2