feat: custom spine skin instructions

Author: InfernoDragon0

src/content/docs/reference/skins.md

@@ -3,7 +3,51 @@ title: Skins
 description: Documentation on how to add a custom skin using the Cult of the Lamb API
 ---
 
-## Creating Skins
+# Skins
+
+This section is for loading custom spine using code, if you prefer using easier format (ie, JSON), check out [JSONSkin Loader](https://thunderstore.io/c/cult-of-the-lamb/p/KellyBetty/COTL_JSONLoader/) or [CustomSpineLoader](https://www.nexusmods.com/cultofthelamb/mods/49)
+
+There are currently two methods of customizing skins:
+- Custom Spine Override
+- Skin texture Override
+
+# Creating Custom Spine Overrides
+
+Follow this if you have a Spine Skeleton and Atlas file. If not, you will need to use Skin Overrides instead.
+
+### Exporting a usable Spine Skin
+- Ensure that you have exported the Spine Skin via 3.8.99 Spine
+- Export as a JSON file.
+- Output: Nonessential data: TRUE, Animation cleanup: TRUE, Warnings: TRUE
+- Texture atlas: Pack TRUE with default Pack Settings
+- If any warnings occur, it may be best to fix them, or the skin may not load into game.
+
+### Loading the Spine Skin into Game
+
+Simply follow the below to load the Spine into game:
+
+```TextAsset atlasTextAsset, skeleTextAsset``` should be your .atlas file and .json file generated by Spine.
+
+```Texture2D[] textures``` is an array of Texture2D that was packed with your Texture atlas.
+
+```Material material``` is any Material with any Shader that you want to apply to the Spine Skeleton.
+
+```string playerSpineName``` can be any string.
+
+```string skinName``` must be your Skin's Name, from Spine.
+
+
+```csharp
+var runtimeAtlasAsset = Spine.Unity.SpineAtlasAsset.CreateRuntimeInstance(atlasTextAsset, textures, material, true);
+var runtimeSkeletonAsset = Spine.Unity.SkeletonDataAsset.CreateRuntimeInstance(skeleTextAsset, runtimeAtlasAsset, true);
+CustomSkinManager.AddPlayerSpine(playerSpineName, runtimeSkeletonAsset, skinList.ToList());
+CustomSkinManager.ChangeSelectedPlayerSpine(playerSpineName + "/" + skinName);
+```
+
+
+# Creating Skin Texture Overrides
+
+Follow this if you are NOT making a Spine Override. This is for Skin Overrides.
 
 **This applies to both follower skins and player skins.**