Add ModMenu "integration"

src/client/java/su/a71/new_soviet/config/ModMenuCompat.java

@@ -0,0 +1,19 @@
+package su.a71.new_soviet.config;
+
+import com.terraformersmc.modmenu.api.ConfigScreenFactory;
+import com.terraformersmc.modmenu.api.ModMenuApi;
+import net.minecraft.client.gui.screen.Screen;
+import net.minecraft.text.Text;
+
+public class ModMenuCompat implements ModMenuApi{
+    @Override
+    public ConfigScreenFactory<?> getModConfigScreenFactory() {
+        return screen -> new Screen(Text.of("")) {
+            @Override
+            protected void init() {
+                Config.openConfigFile();
+                this.client.setScreen(screen);
+            }
+        };
+    }
+}