add ci build

.github/workflows/ci.yml

@@ -0,0 +1,26 @@
+name: Java CI
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v3
+
+    - name: Set up JDK 11
+      uses: actions/setup-java@v3
+      with:
+        distribution: 'temurin'
+        java-version: '11'
+        cache: 'gradle'
+
+    - name: Build with Gradle
+      run: ./gradlew build