add README

README.md

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+This initial release contains a minimal integration of [LLaMa-Mesh](https://github.com/nv-tlabs/LLaMA-Mesh) in Blender.
+
+# Installation
+
+Go to the [Latest Release](https://github.com/huggingface/meshgen/releases/latest) page for a download link and installation instructions.
+
+# Setup
+- In `MeshGen` addon preferences, click `Download Required Models`
+- If set up correctly, addon preferences should display the message `Ready to generate. Press 'N' -> MeshGen to get started.'
+
+# Usage
+
+- Press `N` -> `MeshGen`
+- Click `Load Generator` (this will take a while)
+- Enter a prompt, for example: `Create a 3D obj file using the following description: a desk`
+- Click `Generate Mesh`
+
+# Troubleshooting
+
+- Find errors in the console:
+  - Windows: In Blender, go to `Window` -> `Toggle System Console`
+  - Mac/Linux: Launch Blender from the terminal
+- Report errors in [Issues](https://github.com/huggingface/meshgen/issues)