fix : linguist attributes

Author: roshangautam

.gitattributes

@@ -7,4 +7,8 @@
 .editorconfig export-ignore
 .styleci.yml export-ignore
 .travis.yml export-ignore
-phpunit.xml.dist export-ignore
+phpunit.xml.dist export-ignore
+
+*.less linguist-vendored
+*.css linguist-vendored
+*.js linguist-vendored