merge examples into the repository (#23)

* move examples into this repo

* update ci

* update readme in examples

Author: Yu-zh

.github/workflows/main.yml

@@ -22,7 +22,7 @@ jobs:
           args: '--set-exit-if-changed'
 
       - name: Prepare test env
-        run:  script/prepare-test-env.sh
+        run:  client/script/prepare-test-env.sh
 
       - name: Set up JDK 11
         uses: actions/setup-java@v2
@@ -34,4 +34,32 @@ jobs:
         uses: gradle/wrapper-validation-action@e6e38bacfdf1a337459f332974bb2327a31aaf4b
 
       - name: Build and test with Gradle
-        run: ./gradlew build
+        run: cd client && ./gradlew build
+
+  build-examples:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: check code format
+        uses: axel-op/googlejavaformat-action@v3
+        with:
+          version: '1.10.0'
+          skipCommit: true
+          args: '--set-exit-if-changed'
+
+      - name: Prepare env
+        run:  examples/start-hstreamdb.sh
+
+      - name: Set up JDK 11
+        uses: actions/setup-java@v2
+        with:
+          java-version: '11'
+          distribution: 'adopt'
+
+      - name: Validate Gradle wrapper
+        uses: gradle/wrapper-validation-action@e6e38bacfdf1a337459f332974bb2327a31aaf4b
+
+      - name: Build and run examples
+        run: cd examples && ./gradlew build