Add .gitattributes

.gitattributes

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+# Autodetect text files and ensure that we normalise their
+# line endings to lf internally. When checked out they may
+# use different line endings.
+* text=auto
+
+# Check out with crlf (Windows) line endings
+*.sln text eol=crlf
+*.csproj text eol=crlf
+*.cs text diff=csharp eol=crlf
+*.resx text eol=crlf
+*.vsixmanifest text eol=crlf
+packages.config text eol=crlf
+App.config text eol=crlf
+*.bat text eol=crlf
+*.cmd text eol=crlf
+*.snippet text eol=crlf
+*.manifest text eol=crlf
+*.licenseheader text eol=crlf
+
+# Check out with lf (UNIX) line endings
+*.sh text eol=lf
+.gitignore text eol=lf
+.gitattributes text eol=lf
+*.md text eol=lf
+.travis.yml text eol=lf