adding custom worldtypes round 2

src/lib/translations/en/wiki.json

@@ -95,6 +95,9 @@
 		},
 		"sounds": {
 			"title": "Adding Sounds"
+		},
+		"world_types": {
+			"title": "Adding World Types"
 		}
 	}
 }

wiki/misc/world_types/+page.yml

@@ -0,0 +1,2 @@
+title: wiki.misc.world_types.title
+index: 0

wiki/misc/world_types/en.md

@@ -0,0 +1,77 @@
+---
+title: Adding a Custom World Preset
+index: 0
+---
+
+# Adding custom world presets
+If your mod completely overhauls Minecraft's worldgen, you'll likely want to create a custom worldtype to offer users the option to use your worldgen or MC's vanilla worldgen.
+Now, what is a custom worldtype you may ask? World types define world generation options for Minecraft worlds. They let you change the make-up of your Minecraft worlds by configuring how world generation behaves.
+
+<br/>
+<br/>
+
+Here is where you specify which dimensions your world preset will apply to. In `"dimension"`, a `"minecraft:overworld"` object is required.
+The dimension `type` can be a built-in preset or a custom dimension preset you implement in your mod.
+
+
+`src/main/resources/data/minecraft/example_mod/worldgen/world_preset`
+```json
+{
+	"dimensions": {
+		"minecraft:overworld": {
+			"type": "example_mod:example_mod_dimension_type"
+		}
+	}
+}
+```
+
+<br/>
+<br/>
+
+`generator` is where you specify how the worldgen in your world preset behaves. The `type` is a "generator ID" and the following are valid generator IDs:
+```
+noise
+```
+
+`biome_source` is where you specify how biomes generate. The `type` parameter here is what kind of biome generation will be used.
+Valid generation types:
+```
+multi_noise
+```
+
+If the biome source `type` happens to be `minecraft:multi_noise`, Minecraft will use 3D biomes in the overworld and the nether.
+The `preset` can be `minecraft:overworld` or `minecraft:nether`. More info about this can be found [here](https://minecraft.wiki/w/Custom_dimension#Multi-noise_biome_source_parameter_list).
+
+`src/main/resources/data/minecraft/example_mod/worldgen/world_preset/example_mod_preset.json`
+```json
+{
+	"dimensions": {
+		"minecraft:overworld": {
+			"type": "minecraft:overworld",
+			"generator": {
+				"type": "minecraft:noise",
+				"biome_source": {
+					"type": "minecraft:multi_noise",
+					"preset": "minecraft:overworld"
+				}
+			}
+		}
+	}
+}
+```
+
+<br/>
+<br/>
+
+In order for your world preset to show in the "create a new world" screen, you will need to make a file called `normal.json` in `resources/data/minecraft/tags/worldgen/world_preset` and populate it with the following.
+
+`src/main/resources/data/minecraft/tags/worldgen/world_preset/normal.json`
+```json
+{
+	"values": [
+		"example_mod:example_mod_preset"
+	]
+}
+```
+
+Alternatively, if you want your world preset to only show as an option while the user is holding down ALT, make a file called `extended.json` in the same directory as your `normal.json` file.