Add Vein Mining groups docs

docs/veinmining/_category_.json

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+{
+  "label": "Vein Mining",
+  "position": 10,
+  "link": {
+    "type": "generated-index",
+    "description": "A lightweight, highly configurable Vein Mining enchantment for tools."
+  }
+}

docs/veinmining/block-groups.md

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+---
+sidebar_position: 1
+---
+
+# Assigning Block Groups
+
+A tutorial on how to assign blocks to groups so that they are vein mined together when applicable.
+
+## Overview
+Block groups are used by Vein Mining to determine which blocks should be vein mined together if they are next to each
+other but are not the same type of block. This is useful when there are different blocks in a world that share
+enough similar characteristics that they should be vein mined together and not separately. For example, ores and their
+deepslate versions are functionally identical. As such, Vein Mining configures these groupings natively already.
+
+These groups can be configured through the configuration file or through datapacks, allowing both modpack developers and
+mod developers to specify which groupings should apply within their specific environment.
+
+## Configuration
+---
+The configuration field for block groups is located in the `veinmining-server.toml` file in the `config` folder in the
+root Minecraft instance folder.
+
+The field is called `groupsList` and will, by default, be auto-populated with a list of common ore tags so that similar
+ores can be vein mined together.
+
+This is represented as a list of strings, and each string is a group entry with blocks IDs or tags seperated by a
+semicolon.
+
+### Example
+```toml
+groupsList = ["minecraft:grass_block;minecraft:dirt", "minecraft:diamond_ore;minecraft:emerald_ore"]
+```
+These entries specify two different groups:
+* Group 1 - Grass blocks and dirt blocks
+* Group 2 - Diamond ores and emerald ores
+
+This means that, when vein mined, grass blocks and dirt blocks will be vein mined together. This applies regardless of
+which block is the origin block. The same will apply to diamond ores and emerald ores.
+
+## Datapack
+---
+Block groups can be specified purely through datapacks, allowing specifications to be applied without depending on Vein
+Mining directly. The data file should be created as `~/data/(namespace)/veinmining/groups.json` in the datapack.
+
+:::note
+The `(namespace)` field should be replaced by the namespace chosen for this portion of the datapack. If this is a part
+of a mod, the namespace is usually the mod ID. If this is part of a user-defined datapack, then the namespace can be
+anything that is lowercased with no special characters.
+:::
+
+### Syntax
+The structure of the `.json` file for the groups consists of a top-level JSON object that holds various fields
+related to the groups specifications.
+
+| Field     | Type     | Default | Required | Description                                                                            |
+|-----------|----------|---------|----------|----------------------------------------------------------------------------------------|
+| `replace` | boolean  | `false` | `false`  | If true, replaces all entries on lower-priority datapacks with this one                |
+| `groups`  | string[] | `[]`    | `false`  | The list of block groups represented as an array of string arrays of block IDs or tags |
+
+### Example
+```json
+{
+  "replace": false,
+  "groups": [
+    ["minecraft:grass_block", "minecraft:dirt"],
+    ["minecraft:diamond_ore", "minecraft:emerald_ore"]
+  ]
+}
+```
+Same as the example from [the previous section](#-example), this `groups.json` file specifies two different groups:
+* Group 1 - Grass blocks and dirt blocks
+* Group 2 - Diamond ores and emerald ores
+
+This means that, when vein mined, grass blocks and dirt blocks will be vein mined together. This applies regardless of
+which block is the origin block. The same will apply to diamond ores and emerald ores.