Create .gitattributes (#75)

Author: angelazhangmsft

.gitattributes

@@ -0,0 +1,12 @@
+* text=auto
+
+# Force specific files that git doesn't know should always be CRLF
+*.idl text eol=crlf
+*.h text eol=crlf
+*.cpp text eol=crlf
+*.sln text eol=crlf
+*.props text eol=crlf
+*.targets text eol=crlf
+*proj text eol=crlf
+*.cmd text eol=crlf
+*.ps1 text eol=crlf