Add /.idea/ to bdep-new .gitignore

[ghost]

bdep new will create .gitignore with /.idea/ to ignore JetBrains's (clion) IDE files

.bdep/
/.idea/

# Compiler/linker output.
#
*.d
...

[boris-kolpackov]

Thanks for the suggestion/patch. I am, however, wondering, if this is the best approach. Specifically, will we keep adding things like this for other IDEs/tools/etc? If so, this will result in the generated .gitignore growing to include "everything under the sun" which I personally don't find appealing (I like to keep only what I need).

Perhaps we need to think about some kind of templating/skeleton system for bdep-new? For example, it could be a directory that contains prefix/suffix files that are added before/after the generated content. As well as, maybe, other files (say, like README) that are copied over?