Add .gitattributes

.gitattributes

+# Set the default behavior, in case people 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.
+*.rs text
+
+# Denote all files that are truly binary and should not be modified.
+*.png binary
+*.jpg binary