feat: add initial People Playground mod development kit

extracted_wiki_content/snippets/activation_action.txt

@@ -0,0 +1,14 @@
+URL: https://wiki.studiominus.nl/snippets/activation.html
+Title: People Playground Modding - Activation action
+==================================================
+
+Activation action
+This code snippet shows how to execute code when the player activates the object.
+//add a built-in component that invokes a delegate when the item receives an activation signal
+Instance.AddComponent<UseEventTrigger>().Action = () =>
+{
+    //everything inside this delegate will be executed
+    
+    //show a notification to the player
+    ModAPI.Notify("I'VE BEEN USED!");
+};