Add .gitattributes (microsoft#657)

.gitattributes

@@ -0,0 +1,67 @@
+# Set default behavior to automatically normalize line endings.
+* text=auto
+
+*.doc diff=astextplain
+*.DOC diff=astextplain
+*.docx diff=astextplain
+*.DOCX diff=astextplain
+*.dot diff=astextplain
+*.DOT diff=astextplain
+*.pdf diff=astextplain
+*.PDF diff=astextplain
+*.rtf diff=astextplain
+*.RTF diff=astextplain
+
+*.jpg binary
+*.png binary
+*.gif binary
+
+# Force bash scripts to always use lf line endings so that if a repo is accessed
+# in Unix via a file share from Windows, the scripts will work.
+*.in text eol=lf
+*.sh text eol=lf
+
+# Likewise, force cmd and batch scripts to always use crlf
+*.cmd text eol=crlf
+*.bat text eol=crlf
+
+*.cs text=auto diff=csharp
+*.vb text=auto
+*.resx text=auto
+*.c text=auto
+*.cpp text=auto
+*.cxx text=auto
+*.h text=auto
+*.hxx text=auto
+*.py text=auto
+*.rb text=auto
+*.java text=auto
+*.html text=auto
+*.htm text=auto
+*.css text=auto
+*.scss text=auto
+*.sass text=auto
+*.less text=auto
+*.js text=auto
+*.lisp text=auto
+*.clj text=auto
+*.sql text=auto
+*.php text=auto
+*.lua text=auto
+*.m text=auto
+*.asm text=auto
+*.erl text=auto
+*.fs text=auto
+*.fsx text=auto
+*.hs text=auto
+
+*.csproj text=auto
+*.vbproj text=auto
+*.fsproj text=auto
+*.dbproj text=auto
+*.sln text=auto eol=crlf
+
+# Set linguist language for .h files explicitly based on
+# https://github.com/github/linguist/issues/1626#issuecomment-401442069
+# this only affects the repo's language statistics
+*.h linguist-language=C