modification of Friend adding process in Firebase chatting app — 5

Modification of Friend adding process in Firebase chatting app is required.
Attached is the ppt for required new process, and, short description of present friend process.

◈Important :
1. Before chatting, please see the source codes , and, ppt first
2. please compare the flow of source code with the flow in ppt.
3. please comment the mistake in flow of source code, first.

* Please keep in mind that there are language button in spash/landing page.