Working on lifecycle.

src/main/java/appeng/core/AppEngServerStartup.java

@@ -0,0 +1,12 @@
+package appeng.core;
+
+import appeng.server.AppEngServer;
+import net.fabricmc.api.DedicatedServerModInitializer;
+
+@SuppressWarnings("unused")
+public class AppEngServerStartup implements DedicatedServerModInitializer {
+    @Override
+    public void onInitializeServer() {
+        AppEngHolder.INSTANCE = new AppEngServer();
+    }
+}