added credentials placeholder for front-end

Author: william26

.gitignore

@@ -1,2 +1,3 @@
 config.js
 node_modules
+credentials.js

public/index.html

@@ -98,6 +98,7 @@ <h3>Your profile</h3>
         <script src="http://netdna.bootstrapcdn.com/bootstrap/3.1.1/js/bootstrap.min.js"></script>
         <script src="src/oauth.js"></script>
         <script src="src/background.js"></script>
+        <script src="src/credentials.js"></script>
         <script src="src/script.js"></script>
     </body>
 </html>