feat: add initial People Playground mod development kit

extracted_wiki_content/snippets/editing_pre_existing_items.txt

@@ -0,0 +1,9 @@
+URL: https://wiki.studiominus.nl/snippets/editingExistingItems.html
+Title: People Playground Modding - Editing pre-existing items
+==================================================
+
+Editing pre-existing items
+by Talon
+A decently underutilized function of the modding API is the ability to change items that already exist.
+ModAPI.FindSpawnable("Sword").Description = "This sword SUCKS!!!";
+ModAPI.FindSpawnable("Sword").Prefab.GetComponent<SpriteRenderer>().color = Color.red;