Implement initial plugin version

.gitignore

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+target/
+
+.idea/
+*.iml

README.md

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+Flexmark (Markdown) Formatter for Jenkins
+=========================================
+
+This Jenkins plugin adds a Markup Formatter that can process Markdown
+using Flexmark.

pom.xml

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+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+        xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <parent>
+        <groupId>org.jenkins-ci.plugins</groupId>
+        <artifactId>plugin</artifactId>
+        <version>4.2</version>
+    </parent>
+
+    <groupId>de.aservo</groupId>
+    <artifactId>flexmark-formatter-jenkins-plugin</artifactId>
+    <version>0.1</version>
+    <packaging>hpi</packaging>
+
+    <developers>
+        <developer>
+            <name>Patrick Hobusch</name>
+            <email>[email protected]</email>
+            <organization>ASERVO Software GmbH</organization>
+            <organizationUrl>https://www.aservo.com</organizationUrl>
+        </developer>
+    </developers>
+
+    <properties>
+        <java.level>8</java.level>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>com.vladsch.flexmark</groupId>
+            <artifactId>flexmark</artifactId>
+            <version>0.62.2</version>
+        </dependency>
+        <dependency>
+            <groupId>com.vladsch.flexmark</groupId>
+            <artifactId>flexmark-util</artifactId>
+            <version>0.62.2</version>
+        </dependency>
+    </dependencies>
+
+    <repositories>
+        <repository>
+            <id>repo.jenkins-ci.org</id>
+            <url>http://repo.jenkins-ci.org/public/</url>
+        </repository>
+    </repositories>
+
+    <pluginRepositories>
+        <pluginRepository>
+            <id>repo.jenkins-ci.org</id>
+            <url>http://repo.jenkins-ci.org/public/</url>
+        </pluginRepository>
+    </pluginRepositories>
+
+</project>

src/main/java/de/aservo/jenkins/FlexmarkFormatter.java

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+package de.aservo.jenkins;
+
+import com.vladsch.flexmark.html.HtmlRenderer;
+import com.vladsch.flexmark.parser.Parser;
+import com.vladsch.flexmark.util.ast.Node;
+import com.vladsch.flexmark.util.data.MutableDataSet;
+import hudson.Extension;
+import hudson.markup.MarkupFormatter;
+import hudson.markup.MarkupFormatterDescriptor;
+import org.kohsuke.stapler.DataBoundConstructor;
+
+import javax.annotation.Nonnull;
+import java.io.IOException;
+import java.io.Writer;
+
+public class FlexmarkFormatter extends MarkupFormatter {
+
+    @DataBoundConstructor
+    public FlexmarkFormatter() {
+    }
+
+    @Override
+    public void translate(
+            final String markup,
+            final Writer output) throws IOException {
+
+        final MutableDataSet options = new MutableDataSet();
+        final Parser parser = Parser.builder(options).build();
+        final HtmlRenderer renderer = HtmlRenderer.builder(options).build();
+
+        final Node document = parser.parse(markup);
+        output.write(renderer.render(document));
+    }
+
+    @Extension
+    public static class DescriptorImpl extends MarkupFormatterDescriptor {
+
+        @Nonnull
+        @Override
+        public String getDisplayName() {
+            return "Flexmark (Markdown)";
+        }
+
+    }
+
+}

src/main/resources/index.jelly

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+<?jelly escape-by-default='true'?>
+<div>
+  This plugin adds a Markup Formatter than can process Markdown using Flexmark
+</div>