Added jacoco test coverage report workflow

.github/workflows/coverage.yml

@@ -0,0 +1,31 @@
+name: Measure coverage
+
+on:
+  pull_request:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    permissions:
+      pull-requests: write
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up JDK 1.8
+        uses: actions/setup-java@v1
+        with:
+          java-version: 1.8
+      - name: Run Coverage
+        run: |
+          chmod +x gradlew
+          ./gradlew jacocoRootReport
+
+      - name: Add coverage to PR
+        id: jacoco
+        uses: madrapps/jacoco-report@v1.6.1
+        with:
+          paths: |
+            ${{ github.workspace }}/**/build/reports/jacoco/jacocoRootReport.xml
+          token: ${{ secrets.GITHUB_TOKEN }}
+          min-coverage-overall: 40
+          min-coverage-changed-files: 60
+