feat: add initial People Playground mod development kit

extracted_wiki_content/snippets/random_sprite_assignment.txt

@@ -0,0 +1,14 @@
+URL: https://wiki.studiominus.nl/snippets/assignTextures.html
+Title: People Playground Modding - Random sprite assignment
+==================================================
+
+Random sprite assignment
+This code snippet shows how to set the sprites of an object that has a random sprite. Think of items like the Handcannon, Bowlingball, and Balloon🎈.
+//get the RandomSpriteBehaviour from the object (if it has one) and assign an array of your sprites to it
+Instance.GetComponent<RandomSpriteBehaviour>().sprites = new Sprite[]
+{
+    ModAPI.LoadSprite("ball_1.png"),
+    ModAPI.LoadSprite("ball_2.png"),
+    ModAPI.LoadSprite("ball_3.png"),
+    ModAPI.LoadSprite("ball_4.png"),
+};