add github action

Author: zzzming

.github/workflows/maven.yml

@@ -0,0 +1,28 @@
+name: ci 
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+  # Also trigger on page_build, as well as release created events
+  page_build:
+  release:
+    types: # This configuration does not affect the page_build event above
+      - created 
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Check out code
+      uses: actions/checkout@v1
+      with:
+        fetch-depth: 1
+
+    - name: Set up JDK 1.8
+      uses: actions/setup-java@v1
+      with:
+        java-version: 1.8
+
+    - name: Build with Maven
+      run: mvn -B package --file pom.xml

README.md

@@ -27,7 +27,7 @@ In .m2/settings.xml,
 ```
 
 In pom.xml,
-```maven
+```pom.xml
 <dependency>
   <groupId>io.kafkaesque.pulsar</groupId>
   <artifactId>pulsar-client-plugin</artifactId>
@@ -36,7 +36,8 @@ In pom.xml,
 
 ```
 
-``` java
+Java Client example:
+``` example.java
 String domain = "https://<your auth0 domain>.auth0.com/oauth/token";
 String clientId = "";
 String clientSecret = "";