Add CI pipeline (#7)

diff --git a/.github/workflows/compatibility.yml b/.github/workflows/compatibility.yml
new file mode 100644
index 0000000..710607e
--- /dev/null
+++ b/.github/workflows/compatibility.yml
@@ -0,0 +1,66 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+name: IntelliJ Platform Plugin Compatibility
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  compatibility:
+    name: Ensure plugin compatibility against 2018.1 ~ 2020.3 for IDEA Community, IDEA Ultimate
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v1
+
+      - name: Setup Java 11
+        uses: actions/setup-java@v1
+        with:
+          java-version: 11
+
+      - name: Build the plugin using Gradle
+        run: ./gradlew buildPlugin
+
+      - name: Verify Plugin on IntelliJ Platforms
+        id: verify
+        uses: ChrisCarini/intellij-platform-plugin-verifier-action@latest
+        with:
+          ide-versions: |
+            ideaIC:2018.1
+            ideaIC:2018.2
+            ideaIC:2018.3.6
+            ideaIC:2019.1.4
+            ideaIC:2019.3
+            ideaIC:2020.1
+            ideaIC:2020.2
+            ideaIC:2020.3
+            ideaIU:2018.1
+            ideaIU:2018.2
+            ideaIU:2018.3.6
+            ideaIU:2019.1.4
+            ideaIU:2019.3
+            ideaIU:2020.1
+            ideaIU:2020.2
+            ideaIU:2020.3
+      - name: Get log file path and print contents
+        run: |
+          echo "The verifier log file [${{steps.verify.outputs.verification-output-log-filename}}] contents : " ;
+          cat ${{steps.verify.outputs.verification-output-log-filename}}
diff --git a/.github/workflows/gradle.yml b/.github/workflows/gradle.yml
new file mode 100644
index 0000000..cee8c15
--- /dev/null
+++ b/.github/workflows/gradle.yml
@@ -0,0 +1,40 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+name: Java CI with Gradle
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up JDK 11
+        uses: actions/setup-java@v1
+        with:
+          java-version: 11
+      - name: Grant execute permission for gradlew
+        run: chmod +x gradlew
+      - name: Build with Gradle
+        run: ./gradlew build