Add CI support (#12)

* Add CI workflow defintion
* Add unit test conf file
* update readme with build info

.github/workflows/main.yml

@@ -0,0 +1,27 @@
+name: Build
+
+on: [push,pull_request,workflow_dispatch]
+
+jobs:
+   build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        smalltalk: [ 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@v1
+        with:
+          name: ${{matrix.os}}-${{matrix.smalltalk}}
+          token: ${{ secrets.CODECOV_TOKEN }}

.smalltalkci/.unit-tests.ston

@@ -0,0 +1,16 @@
+SmalltalkCISpec {
+  #loading : [
+    SCIMetacelloLoadSpec {
+      #baseline : 'XPath',
+      #directory : '../src',
+      #load : [ 'Tests' ],
+      #platforms : [  #pharo ]
+    }
+  ],
+  #testing : {
+    #coverage : {
+      #packages : [ 'XPath*' ],
+      #format: #lcov
+    }
+  }
+}

README.md

@@ -2,6 +2,11 @@
 
 [![Build Status](https://travis-ci.org/pharo-contributions/XML-XPath.svg?branch=master)](https://travis-ci.org/pharo-contributions/XML-XPath) [![Coverage Status](https://coveralls.io/repos/github/pharo-contributions/XML-XPath/badge.svg?branch=master)](https://coveralls.io/github/pharo-contributions/XML-XPath?branch=master)
 
+
+[![Unit Tests](https://github.com/pharo-contributions/XML-XPath/workflows/Build/badge.svg?branch=master)](https://github.com/pharo-contributions/XML-XPath/actions?query=workflow%3ABuild)
+[![Coverage Status](https://codecov.io/github/pharo-contributions/XML-XPath/coverage.svg?branch=master)](https://codecov.io/gh/pharo-contributions/XML-XPath/branch/master)
+
+
 An XPath library for [Pharo](http://www.pharo.org) leveraging the XML parsing capabilities of [XMLParser](https://github.com/pharo-contributions/XML-XMLParser). Supports XPath 1.0 syntax with extensions.
 
 ## Installation