Add inventory module overview

Author: TrentinTheKid

docs/developers/modules/inventory.mdx

@@ -5,6 +5,14 @@ import { Callout } from 'nextra-theme-docs'
 
 ## Overview
 
+The inventory module allows you to create customizable and professional user interfaces for Lunar Client users.
+
+- Add custom NBT tags to items to control how users interact with them on click.
+  - Ability to make items unclickable. (Cancels the event client-side)
+  - Ability to open URLs. (Respects chat privacy settings)
+  - Ability to suggest & run commands. (Handled client-side)
+  - Ability to copy to clipboard.
+
 ## Integration
 
 ### Sample Code