feat: add initial People Playground mod development kit

extracted_wiki_content/internalReference/limbspritecache_key.txt

@@ -0,0 +1,36 @@
+URL: https://wiki.studiominus.nl/internalReference/LimbSpriteCache_Key.html
+Title: People Playground Modding - LimbSpriteCache.Key
+==================================================
+
+public readonly struct Key
+This nested type resides in LimbSpriteCache
+Inherits IEquatable<Key>
+No description provided
+Fields
+public readonly Sprite Original
+No description provided
+
+public readonly Texture2D Skin
+No description provided
+
+public readonly Texture2D Flesh
+No description provided
+
+public readonly Texture2D Bone
+No description provided
+
+public readonly float Scale
+No description provided
+
+Methods
+public (constructor) Key(Sprite original, Texture2D skin, Texture2D flesh, Texture2D bone, float scale)
+No description provided
+
+public override bool Equals(object obj)
+No description provided
+
+public bool Equals(Key other)
+No description provided
+
+public override int GetHashCode()
+No description provided