Add Coverage upload to GH action with badge in README

.github/workflows/tests.yml

@@ -34,3 +34,9 @@ jobs:
         run: smalltalkci -s ${{ matrix.pharo-version }} ${{ matrix.ston }}
         shell: bash
         timeout-minutes: 40
+
+      - name: Upload coverage to Codecov
+        uses: codecov/codecov-action@v1
+        with:
+          name: ${{matrix.os}}-${{matrix.smalltalk}}
+          token: ${{ secrets.CODECOV_TOKEN }}

README.md

@@ -3,6 +3,12 @@ A Pharo driver for [MongoDB](https://www.mongodb.com/).
 
 [![CI](https://github.com/pharo-nosql/mongotalk/actions/workflows/tests.yml/badge.svg)](https://github.com/pharo-nosql/mongotalk/actions/workflows/tests.yml)
 
+[![Coverage Status](https://codecov.io/github/pharo-nosql/mongotalk/coverage.svg?branch=master)](https://codecov.io/gh/pharo-nosql/mongotalk/branch/master)
+
+[![Pharo 10](https://img.shields.io/badge/Pharo-10-%23aac9ff.svg)](https://pharo.org/download)
+[![Pharo 11](https://img.shields.io/badge/Pharo-11-%23aac9ff.svg)](https://pharo.org/download)
+[![Pharo 12](https://img.shields.io/badge/Pharo-12-%23aac9ff.svg)](https://pharo.org/download)
+
 ## Getting Started
 
 We can open a connection to a mongodb server and perform a write operation as follows: