Create new github actions

.github/workflows/ci.yml

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+name: Continuous Integration
+
+on: [push]
+
+jobs:
+  Build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v1
+    - name: Set up JDK 1.8
+      uses: actions/setup-java@v1
+      with:
+        java-version: 1.8
+    - name: Build
+      run: mvn -DskipTests package --file pom.xml
+
+  Test:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v1
+    - name: Set up JDK 1.8
+      uses: actions/setup-java@v1
+      with:
+        java-version: 1.8
+    - name: Test
+      run: mvn test --file pom.xml

sonar-project.properties

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+sonar.organization=marci4-github
+sonar.projectKey=org.java-websocket:Java-WebSocket
+
+# relative paths to source directories. More details and properties are described
+# in https://sonarcloud.io/documentation/project-administration/narrowing-the-focus/ 
+sonar.sources=src/main/java/org/java_websocket