feat: add initial People Playground mod development kit

extracted_wiki_content/snippets/debug_drawing.txt

@@ -0,0 +1,41 @@
+URL: https://wiki.studiominus.nl/snippets/debug.html
+Title: People Playground Modding - Debug drawing
+==================================================
+
+Debug drawing
+This code snippet shows how to draw lines and shapes for debugging purposes. Do not use this code in a released mod. It is meant for debugging only and will cause performance issues.
+public class SuperCoolBehaviour : MonoBehaviour
+{
+    private void Awake()
+    {
+        //create polygon collider for demonstration purposes
+        var poly = gameObject.AddComponent<PolygonCollider2D>();
+        poly.SetPath(0, new[]{
+            new Vector2(0,0),
+            new Vector2(5,0),
+            new Vector2(0,5),
+        });
+    }
+
+    //you should generally draw debug primitives in OnWillRenderObject
+    private void OnWillRenderObject()
+    {
+        //NEVER USE ModAPI.Draw IN YOUR RELEASED MOD
+        //THEY ARE SLOW AND NOT MEANT FOR ANYTHING OTHER THAN DEBUGGING
+
+        //draw line from this GameObject to some place else
+        ModAPI.Draw.Line(transform.position, new Vector3(76, 43));
+
+        //draw rectangle here and with width 4, height 2
+        ModAPI.Draw.Rect(transform.position, new Vector3(4,2));
+
+        //draw a cool circle with a radius of 8 at the transform position
+        ModAPI.Draw.Circle(transform.position, 8);
+
+        //draw the effective shapes of all colliders attached to this object
+        foreach (var item in GetComponents<Collider2D>())
+        {
+            ModAPI.Draw.Collider(item);
+        }
+    }
+}