added github action

.github/workflows/main.yml

@@ -0,0 +1,22 @@
+name: Build
+
+on: 
+  pull_request:
+  push:
+    branches: 
+      - main
+
+jobs:
+  test:
+    name: Package and run all tests
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+      with:
+        fetch-depth: 0
+    - name: Set up JDK
+      uses: actions/setup-java@v1
+      with:
+        java-version: 8
+    - name: Run Maven Targets
+      run: mvn package --batch-mode --show-version --no-transfer-progress