feat: update workspace paths and enhance gitignore

- Updated stablediffusion crate path from "../stable-diffusion-burn" to "./crates/stable-diffusion-burn" for proper workspace resolution
- Enhanced .gitignore to include generated model files (.mpk, .pt, .bin, .safetensors, .ckpt) and user_data directory
- Added Cargo.lock to gitignore with appropriate comment
- Reorganized IDE files section in gitignore for better clarity
- Added newline at end of file for proper formatting

crates/stable-diffusion-burn/burn-crates/burn-tensor/README.md

@@ -0,0 +1,12 @@
+# Burn Tensor
+
+> [Burn](https://github.com/tracel-ai/burn) Tensor Library
+
+[![Current Crates.io Version](https://img.shields.io/crates/v/burn-tensor.svg)](https://crates.io/crates/burn-tensor)
+[![license](https://shields.io/badge/license-MIT%2FApache--2.0-blue)](https://github.com/tracel-ai/burn-tensor/blob/master/README.md)
+
+This library provides the core abstractions required to run tensor operations with Burn.
+
+`Tensor`s are generic over the backend to allow users to perform operations using different
+`Backend` implementations. Burn's tensors also support auto-differentiation thanks to the
+`AutodiffBackend` trait.