Initial Maven setup

Currently not building anything just setting up the build and Github
action

For de-jcup#371

.github/workflows/maven.yml

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+# This workflow will build a Java project with Gradle
+# For more information see: https://help.github.com/actions/language-and-framework-guides/building-and-testing-java-with-gradle
+
+name: Java CI with Gradle
+on: 
+  push:
+    branches-ignore:
+     - documentation
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up JDK 11
+      uses: actions/setup-java@v2
+      with:
+        distribution: 'adopt'
+        java-version: '11'
+    - name: Grant execute permission for gradlew
+      run: chmod +x gradlew
+    - name: Build with Gradle
+      run: ./mvn clean verify

.mvn/extensions.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<extensions>
+  <extension>
+    <groupId>org.eclipse.tycho.extras</groupId>
+    <artifactId>tycho-pomless</artifactId>
+    <version>2.4.0</version>
+  </extension>
+</extensions>

pom.xml

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+<project>
+  <modelVersion>4.0.0</modelVersion>
+  <groupId>eclipse.asciidoctor.editor</groupId>
+  <artifactId>releng</artifactId>
+  <version>1.0.0-SNAPSHOT</version>
+  <packaging>pom</packaging>
+
+  <pluginRepositories>
+    <pluginRepository>
+      <id>tycho-snapshots</id>
+      <url>https://repo.eclipse.org/content/repositories/tycho-snapshots/</url>
+    </pluginRepository>
+  </pluginRepositories>
+
+  <properties>
+    <tycho.version>2.5.0-SNAPSHOT</tycho.version>
+    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+  </properties>
+
+
+  <build>
+
+    <pluginManagement>
+      <plugins>
+        <plugin>
+          <groupId>org.eclipse.tycho</groupId>
+          <artifactId>tycho-p2-director-plugin</artifactId>
+          <version>${tycho.version}</version>
+        </plugin>
+      </plugins>
+    </pluginManagement>
+
+    <plugins>
+      <plugin>
+        <groupId>org.eclipse.tycho</groupId>
+        <artifactId>tycho-maven-plugin</artifactId>
+        <version>${tycho.version}</version>
+        <extensions>true</extensions>
+      </plugin>
+      <!--Enable the replacement of the SNAPSHOT version in the final product configuration-->
+      <plugin>
+        <groupId>org.eclipse.tycho</groupId>
+        <artifactId>tycho-packaging-plugin</artifactId>
+        <version>${tycho.version}</version>
+        <executions>
+          <execution>
+            <phase>package</phase>
+            <id>package-feature</id>
+            <configuration>
+              <finalName>${project.artifactId}_${unqualifiedVersion}.${buildQualifier}</finalName>
+            </configuration>
+          </execution>
+        </executions>
+      </plugin>
+      <plugin>
+        <groupId>org.eclipse.tycho</groupId>
+        <artifactId>target-platform-configuration</artifactId>
+        <version>${tycho.version}</version>
+        <configuration>
+          <target>
+            <file>../target-platform/target-platform.target</file>
+          </target>
+          <resolveWithExecutionEnvironmentConstraints>false</resolveWithExecutionEnvironmentConstraints>
+
+          <environments>
+            <environment>
+              <os>linux</os>
+              <ws>gtk</ws>
+              <arch>x86_64</arch>
+            </environment>
+            <environment>
+              <os>win32</os>
+              <ws>win32</ws>
+              <arch>x86_64</arch>
+            </environment>
+            <environment>
+              <os>macosx</os>
+              <ws>cocoa</ws>
+              <arch>x86_64</arch>
+            </environment>
+          </environments>
+        </configuration>
+      </plugin>
+    </plugins>
+  </build>
+
+
+  <modules>
+
+  </modules>
+</project>