create plugin structure

src/main/java/eu/mhsl/craftattack/spawn/Main.java

@@ -0,0 +1,17 @@
+package eu.mhsl.craftattack.spawn;
+
+import org.bukkit.plugin.java.JavaPlugin;
+
+public final class Main extends JavaPlugin {
+
+    @Override
+    public void onEnable() {
+        // Plugin startup logic
+
+    }
+
+    @Override
+    public void onDisable() {
+        // Plugin shutdown logic
+    }
+}