README update

Author: robamu

README.md

@@ -1,4 +1,8 @@
-# DLE Encoder for Python
+[![Documentation Status](https://readthedocs.org/projects/dle-encoder/badge/?version=latest)](https://dle-encoder.readthedocs.io/en/latest/?badge=latest)
+[![codecov](https://codecov.io/gh/robamu-org/py-dle-encoder/branch/main/graph/badge.svg?token=GQ5VW8PKKS)](https://codecov.io/gh/robamu-org/py-dle-encoder)
+
+DLE Encoder for Python
+======
 
 This encoder provides a simple ASCII transport layer for serial data.
 A give data stream is encoded by adding a STX (0x02) char at the beginning and an ETX (0x03) char at the end.