Basic auto completion docs

Author: Saturn745

autocompletion.md

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+# Auto Completion & Intellisense
+
+<details>
+<summary><strong>VSCode / VSCodium Setup</strong></summary>
+
+If you want auto completion and intellisense for LuaLink scripts in VSCode (or VSCodium), follow these simple steps:
+
+### 1. Install the Lua Extension
+
+- Install the **sumneko Lua** extension:
+  - [VSCode Marketplace](https://marketplace.visualstudio.com/items?itemName=sumneko.lua)
+  - [Open VSX](https://open-vsx.org/extension/sumneko/lua)
+
+### 2. Get the LuaLink LLS Addon
+
+- Clone (recommended) or download [LuaLink/lualink-lls-addon](https://github.com/LuaLink/lualink-lls-addon)
+- Cloning is recommended so you can update it easily:
+  ```bash
+  git clone https://github.com/LuaLink/lualink-lls-addon
+  ```
+
+### 3. Configure the Extension
+
+- Open the settings for the Lua extension.
+- Add a new entry to `Lua.workspace.library` and enter the path to your `lualink-lls-addon` folder.
+- Set `Lua.runtime.plugin` to `lualink-lls-addon/plugin.lua`.
+  - This setting requires editing the `settings.json` for the extension directly.
+
+#### Note
+
+It *should* be possible to just add the `lualink-lls-addon` folder to `Lua.workspace.userThirdParty` and have the plugin load only for LuaLink scripts, but in testing this didn't work. If you figure it out, please open an issue or join our Discord!
+
+### Done!
+
+If you did everything right, you should now get auto completion and intellisense for LuaLink in your Lua files. This should make developing scripts much easier!
+
+</details>
+
+<!-- Add more IDE instructions below as needed -->