Added action for build with tests

.github/workflows/maven-tests.yml

@@ -0,0 +1,23 @@
+name: Maven build with tests
+on: [ push, pull_request ]
+jobs:
+  test:
+    name: JDK ${{ matrix.java }}
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        java: [ '8', '11' ]
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up JDK ${{ matrix.java }}
+        uses: actions/setup-java@v1
+        with:
+          java-version: ${{ matrix.java }}
+      - uses: actions/cache@v1
+        with:
+          path: ~/.m2/repository
+          key: ${{ runner.os }}-maven-jdk${{ matrix.java }}-${{ hashFiles('**/pom.xml') }}
+          restore-keys: |
+            ${{ runner.os }}-maven-jdk${{ matrix.java }}-
+      - name: Build with Maven
+        run: mvn -B clean install