Adding .gitattributes to keep line endings consistent

.gitattributes

@@ -0,0 +1,11 @@
+# Set default behaviour, in case users don't have core.autocrlf set.
+* text=auto
+
+# Source files should be normalized
+*.js text
+*.less text
+*.html text
+
+# Declare files that will always have CRLF line endings on checkout.
+*.sln text eol=crlf
+*.jsproj text eol=crlf