[MZ] Added badge

Author: manuelzander

.github/workflows/python-app.yml

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-name: Python application
+name: python_udp_server
 
 on:
   push:

README.md

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 # Python UDP server using asyncio
 
+![python_udp_server](https://github.com/manuelzander/python_udp_server/workflows/python_udp_server/badge.svg?branch=master)
+
 This small project comprises a simple Python UDP server plus Dockerfile, as well as a (hopefully) useful Makefile and unittests.
 
 The server makes use of the `asyncio` library to allow for asynchronous request handling.