clean gRPC-Python start kit

Simple working exmample for Python gRPC

Because example given from the gRPC offical site is too large to handle for those who just want to make with python.

I will add my own sample and also cover most of the examples from gRPC repository

Basic example from gRPC/gRPC

Using basic gRPC server and client(Sync) with GUI(tkinter)

Uses same GUI script(gui.py from 2.chat with GUI) but use streaming connection

working in progress

gRPC Interceptors for client and server side