updated readme

Author: OmgRod

README.md

@@ -3,3 +3,88 @@ A mod made to to change most menus' backgrounds to the Geode one
 
 <img src="logo.png" width="150" alt="Logo" />
 
+## Building
+
+To build this mod, follow one of the methods below:
+
+### VS Code
+
+1. Open the project in VS Code.
+2. Install the necessary dependencies (if not already done).
+3. Select the appropriate build kit for your platform. You can do this by navigating to the "CMake Tools" tab in the bottom left and selecting "Select a Kit".
+4. Choose the correct kit for your environment (e.g., macOS, Windows, etc.).
+5. After selecting the kit, you can build the project by clicking "Build" in the "CMake" tab or by using the terminal command:
+
+```bash
+cmake --build .
+```
+This will compile the mod and generate the necessary files.
+
+### GitHub Actions
+
+1. Push your changes to GitHub.
+2. Open the repository and navigate to the Actions tab.
+3. Select the workflow called "Build Geode Mod".
+4. Choose the latest commit.
+5. After the build is complete, download the generated artifacts from the build step to get the built mod files.
+
+## Adding Layers
+
+### Geometry Dash
+
+To add a custom background layer to a **Geometry Dash** menu, follow the example below. This demonstrates how to add a background layer in `CreatorLayer`.
+
+```cpp
+#include "../SwelvyBG.hpp"
+#include <Geode/Geode.hpp>
+#include <Geode/modify/CreatorLayer.hpp>
+
+using namespace geode::prelude;
+
+class $modify(MyCreatorLayer, CreatorLayer) {
+	bool init() {
+		if (!CreatorLayer::init()) {
+			return false;
+		}
+		if (Mod::get()->getSettingValue<bool>("show-creator")){
+			if (auto bg = this->getChildByID("background")){
+				bg->setVisible(false);
+			}
+
+			auto swelvyBG = SwelvyBG::create();
+			swelvyBG->setZOrder(-2);
+			swelvyBG->setID("swelvy-background");
+
+			this->addChild(swelvyBG);
+		}
+		return true;
+	}
+};
+```
+
+### External Mods
+
+For external mods that modify the background of a specific menu, you can use the following example. This shows how to hook into `GlobedLevelListLayer` to add a custom background.
+
+```cpp
+#include <Geode/Geode.hpp>
+#include "../../SwelvyBG.hpp"
+#include "../../Hooks/Hooker.hpp" 
+
+class GlobedLevelListLayer : public Betterhook::HookBetter { 
+    void init(CCNode* _This) override {
+         if (auto bg = _This->getChildByID("background")) {
+            bg->setVisible(false);
+        }
+
+        SwelvyBG* swelvyBG = SwelvyBG::create();
+        swelvyBG->setZOrder(-1);
+        swelvyBG->setID("swelvy-background");
+        _This->addChild(swelvyBG);
+    }
+
+    const char* PutLayer() const override { return "GlobedLevelListLayer"; }
+};
+
+REGISTER_HookBetter(GlobedLevelListLayer);
+```