feat: add initial People Playground mod development kit

extracted_wiki_content/tutorials/creating_a_custom_behaviour.txt

@@ -0,0 +1,76 @@
+URL: https://wiki.studiominus.nl/tutorials/tutorialCustomBehaviour.html
+Title: People Playground Modding - Creating a custom behaviour
+==================================================
+
+Creating a custom behaviour
+You can create your own MonoBehaviours, meaning you can do pretty much anything you want if you try.
+This tutorial will teach you how to create a simple behaviour and add it to your custom item (that you hopefully created in the previous tutorial).
+1. Creating a behaviour class
+Pretty simple really, especially if you know anything about Unity. You may read the Unity Documentation for this class if you want to know more.
+All you need to do is define a class that inherits MonoBehaviour inside the namespace you created. This can be in the script.cs file.
+public class WhateverBehaviour : MonoBehaviour
+{
+    private void Start()
+    {
+        //Do whatever you want here
+        //I guess we'll make it explode when spawned
+        ExplosionCreator.CreateFragmentationExplosion(
+            32, 
+            transform.position, 
+            4, 
+            7, 
+            true, 
+            false, 
+            0.5f);
+    }    
+}
+
+2. Adding the component to your item
+Also really easy to do. All that needs to be done is adding this line in your AfterSpawn function:
+Instance.AddComponent<WhateverBehaviour>();
+
+This will add the given component to the GameObject.
+If everything went well, your script.cs file will look like this:
+using UnityEngine; 
+
+namespace Mod
+{
+    public class Mod
+    {
+        public static void Main()
+        {
+            ModAPI.Register(
+                new Modification()
+                {
+                    OriginalItem = ModAPI.FindSpawnable("Brick"),
+                    NameOverride = "Blue Brick lmfao -BlueBrick",
+                    DescriptionOverride = "Like a brick but differently coloured.",
+                    CategoryOverride = ModAPI.FindCategory("Misc."),
+                    ThumbnailOverride = ModAPI.LoadSprite("blueBrickView.png"),
+                    AfterSpawn = (Instance) =>
+                    {
+                        Instance.GetComponent<SpriteRenderer>().sprite = ModAPI.LoadSprite("blueBrick.png");
+                        Instance.AddComponent<WhateverBehaviour>();
+                    }
+                }
+            );
+        }
+    }
+
+    public class WhateverBehaviour : MonoBehaviour
+    {
+        private void Start()
+        {
+            ExplosionCreator.CreateFragmentationExplosion(
+                32, 
+                transform.position, 
+                4, 
+                7, 
+                true, 
+                false, 
+                0.5f);
+        }    
+    }
+}
+
+When you spawn the item you added, it should explode.