Added online documentation entry in menu

src/main/java/mosaic/plugins/OnlineOpener.java

+package mosaic.plugins;
+
+
+import ij.plugin.PlugIn;
+
+import java.awt.*;
+import java.io.IOException;
+import java.net.URI;
+import java.net.URISyntaxException;
+
+
+public class OnlineOpener implements PlugIn {
+    @Override
+    public void run(String s) {
+        try {
+            Desktop.getDesktop().browse(new URI(s));
+        } catch (IOException e) {
+            e.printStackTrace();
+        } catch (URISyntaxException e) {
+            e.printStackTrace();
+        }
+    }
+}

src/main/resources/plugins.config

@@ -28,3 +28,6 @@ Plugins>Mosaic>Utility>Cluster, "New cluster profile", mosaic.plugins.NewCluster
 
 Plugins>Mosaic, "Particle Tracker 2D/3D", mosaic.plugins.ParticleTracker3DModular_("run")
 Plugins>Mosaic, "Interaction Analysis", mosaic.plugins.IAPMosaic_("run")
+
+Plugins>Mosaic, "-", null
+Plugins>Mosaic, "Online Documentation", mosaic.plugins.OnlineOpener("https://mosaic.mpi-cbg.de/docs/MosaicSuiteDoc/index.html")
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