docs: add badges to README and enable code coverage reporting (#109)

#109

.github/workflows/testing.yaml

@@ -40,3 +40,6 @@ jobs:
 
       - name: Test with tox environments
         run: tox
+
+      - name: Update Coveralls report
+        uses: coverallsapp/github-action@v2

README.md

@@ -1,5 +1,9 @@
 # E-connect Python API
 
+[![Testing](https://github.com/palazzem/econnect-python/actions/workflows/testing.yaml/badge.svg)](https://github.com/palazzem/econnect-python/actions/workflows/testing.yaml)
+[![Linting](https://github.com/palazzem/econnect-python/actions/workflows/linting.yaml/badge.svg)](https://github.com/palazzem/econnect-python/actions/workflows/linting.yaml)
+[![Building](https://github.com/palazzem/econnect-python/actions/workflows/building.yaml/badge.svg)](https://github.com/palazzem/econnect-python/actions/workflows/building.yaml)
+[![Coverage Status](https://coveralls.io/repos/github/palazzem/econnect-python/badge.svg?branch=main)](https://coveralls.io/github/palazzem/econnect-python?branch=main)
 [![PyPI version](https://badge.fury.io/py/econnect-python.svg)](https://badge.fury.io/py/econnect-python)
 
 `econnect-python` is an API adapter used to control programmatically an Elmo alarm system.