Add .gitattributes file to the repo

(cherry picked from commit 9f093db)

.gitattributes

@@ -0,0 +1,13 @@
+# Set default behaviour, in case users don't have core.autocrlf set.
+*   text=auto
+
+# Explicitly declare text files we want to always be normalized and converted to native line endings on checkout.
+*.sh    text eol=lf
+
+# Declare files that will always have CRLF line endings on checkout.
+*.sln   text eol=crlf
+*.csproj    text eol=crlf
+
+# Denote all files that are truly binary and should not be modified.
+*.png   -text
+*.jpg   -text