feat: add initial People Playground mod development kit

extracted_wiki_content/empty_mod_template.txt

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+URL: https://wiki.studiominus.nl/intro/boilerplate.html
+Title: People Playground Modding - Empty mod template
+==================================================
+
+Empty mod template / Boilerplate
+by Talon
+In modding communities, a Boilerplate/Skeleton is known as the mod base. This will allow you to quickly make new mods without needing to go through the hassle of setting it up from scratch.
+The Boilerplate includes 2 folders for sound effects and sprites, a static ModTag string within mod.cs, and the basic skeleton of an item.
+Download
+Setup
+This tutorial is assuming you're using Visual Studio
+Once you've extracted and installed the boilerplate, you can put it into People Playground\Mods and it'd work fine, but assuming you'd like to modify the code, there are a few more things you'll need to setup.
+After placing the extracted mod into the Mods folder, open Empty.sln and navigate to mod.cs. Here you'll be greeted with a handful of different error messages, all about the missing references. Right click the "References" member from the solution explorer, and select "Add References".
+Press browse and navigate to People Playground\People Playground_Data\Managed, which is where the games .DLL files are contained.
+Your mod determines what files you'll need to reference, but I'll usually stick with the following, adding more if I need them:
+
+Assembly-CSharp.dll
+
+
+UnityEngine.dll
+
+
+UnityEngine.CoreModule.dll
+
+
+UnityEngine.Physics2DModule.dll
+
+Some more advanced things you're able to reference include the UI, Text, and Input modules, depending on what you're modifying.