Add Github action and smalltalk CI

.github/workflows/build.yml

@@ -0,0 +1,27 @@
+name: Build
+
+on: [push,pull_request,workflow_dispatch]
+
+jobs:
+   build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        smalltalk: [ Pharo64-6.1, Pharo64-7.0, Pharo64-8.0, Pharo64-9.0, Pharo64-10, Pharo64-11 ]
+    name: ${{ matrix.smalltalk }}
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up Smalltalk CI
+        uses: hpi-swa/setup-smalltalkCI@v1
+        with:
+          smalltalk-image: ${{ matrix.smalltalk }}
+      - name: Load Image and Run Tests
+        run: smalltalkci -s ${{ matrix.smalltalk }} .smalltalkci/.unit-tests.ston
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        timeout-minutes: 15
+      - name: Upload coverage to Codecov
+        uses: codecov/codecov-action@v3
+        with:
+          name: ${{matrix.os}}-${{matrix.smalltalk}}
+          token: ${{ secrets.CODECOV_TOKEN }}

.smalltalkci/.unit-tests.ston

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+SmalltalkCISpec {
+  #loading : [
+    SCIMetacelloLoadSpec {
+      #baseline : 'BitmapCharacterSet',
+      #directory : '../src',
+      #load : [ 'CI' ],
+      #platforms : [  #pharo ]
+    }
+  ],
+  #testing : {
+    #coverage : {
+      #packages : [ 'Collections-BitmapCharacterSet*' ],
+      #format: #lcov
+    }
+  }
+}

README.md

@@ -1,9 +1,16 @@
 # BitmapCharacterSet
 
-[![Build Status](https://travis-ci.org/pharo-contributions/BitmapCharacterSet.svg?branch=master)](https://travis-ci.org/pharo-contributions/BitmapCharacterSet) [![Coverage Status](https://coveralls.io/repos/github/pharo-contributions/BitmapCharacterSet/badge.svg?branch=master)](https://coveralls.io/github/pharo-contributions/BitmapCharacterSet?branch=master)
-
 **BitmapCharacterSet** is a set for characters that uses a bitmap for storing wide characters and an array of truth values for byte characters. Used by [XMLParser](https://github.com/pharo-contributions/XML-XMLParser).
 
+[![Unit Tests](https://github.com/pharo-contributions/BitmapCharacterSet/workflows/Build/badge.svg?branch=master)](https://github.com/pharo-contributions/BitmapCharacterSet/actions?query=workflow%3ABuild)
+[![Coverage Status](https://codecov.io/github/pharo-contributions/BitmapCharacterSet/coverage.svg?branch=master)](https://codecov.io/gh/pharo-contributions/BitmapCharacterSet/branch/master)
+
+[![Pharo 7](https://img.shields.io/badge/Pharo-9.0-%23aac9ff.svg)](https://pharo.org/download)
+[![Pharo 8](https://img.shields.io/badge/Pharo-9.0-%23aac9ff.svg)](https://pharo.org/download)
+[![Pharo 9](https://img.shields.io/badge/Pharo-9.0-%23aac9ff.svg)](https://pharo.org/download)
+[![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)
+
 ## Installation
 
 ```smalltalk