Basic implementation for files app

web-container-registry/src/main/java/de/nbscloud/webcontainer/registry/App.java

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+package de.nbscloud.webcontainer.registry;
+
+public interface App {
+    // New app:
+    //  1) Create module
+    //  2) Add dependencies (like other app modules)
+    //  3) Register module in web-container module
+    //  4) Add module to dependency management in aggregator pom
+    //  5) Add module package to web-container application @ComponentScan
+
+    String getId();
+
+    String getIcon();
+
+    String getStartPath();
+
+    int getIndex();
+}

web-container-registry/src/main/java/de/nbscloud/webcontainer/registry/AppRegistry.java

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+package de.nbscloud.webcontainer.registry;
+
+import org.springframework.stereotype.Component;
+
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.List;
+import java.util.concurrent.CopyOnWriteArrayList;
+
+@Component
+public class AppRegistry {
+    private final List<App> apps = new CopyOnWriteArrayList<>();
+
+    public void registerApp(App app) {
+        this.apps.add(app);
+
+        this.apps.sort(Comparator.comparing(App::getIndex));
+    }
+
+    public List<App> getAll() {
+        return Collections.unmodifiableList(this.apps);
+    }
+}