feat: add initial People Playground mod development kit

extracted_wiki_content/internalReference/limbspritecache.txt

@@ -0,0 +1,21 @@
+URL: https://wiki.studiominus.nl/internalReference/LimbSpriteCache.html
+Title: People Playground Modding - LimbSpriteCache
+==================================================
+
+public class LimbSpriteCache
+Inherits MonoBehaviour
+No description provided
+Nested types
+LimbSpriteCache.LimbSprites
+LimbSpriteCache.Key
+Fields
+public Dictionary<Key, LimbSprites> Sprites
+No description provided
+
+Properties
+public static LimbSpriteCache Instance { get; set; }
+No description provided
+
+Methods
+public LimbSprites LoadFor(Sprite original, Texture2D skin, Texture2D flesh, Texture2D bone, float scale)
+No description provided