Update README.md

Author: MerlinVR

README.md

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 # VRC-Inventory
 Inventory system generator for Avatar 3.0
+
+Basic script to generate inventory systems for your avatar for use with avatar 3.0.
+
+Setup:
+1. Install the Avatar 3.0 SDK and setup the basic avatar descriptor with all of the default control layers
+2. Install package from the most recent [release](https://github.com/Merlin-san/VRC-Inventory/releases/latest)
+3. Add the Inventory Descriptor component to your avatar
+4. Set the side of the Inventory Slots to the number of inventory items you want
+5. Optionally choose a name for each slot that will show in the UI and an icon for that slot
+6. Add the items under your avatar root that you want to toggle with the inventory to the **Slot Toggle Items** array
+7. Click the **Generate Inventory** button on the bottom of the component
+8. Before uploading delete the inventory descriptor because the SDK currently blocks uploads when it is on the avatar. This will hopefully be fixed soon.