feat: add initial People Playground mod development kit

extracted_wiki_content/tutorials.txt

@@ -0,0 +1,24 @@
+URL: https://wiki.studiominus.nl/tutorials.html
+Title: People Playground Modding - Tutorials
+==================================================
+
+Tutorials
+This category contains several short tutorials that explain basic concepts in People Playground modding, or guide you towards a specific goal.
+
+Creating a mod
+
+Creating a custom item
+
+Creating a custom behaviour
+
+Creating a custom syringe
+
+Creating a custom liquid
+
+Creating a gun with a custom projectile
+
+Creating a custom weapon attachment
+
+Saving, loading, copying, and pasting
+
+Custom liquid mixers