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-communication/README.md

@@ -0,0 +1,15 @@
+# Burn Communication
+
+Abstractions for network communication
+
+The Protocol trait defines how to communicate in a server/client style.
+The server can set up routes with callbacks upon connection.
+
+## WebSocket
+
+Communication with WebSockets is implemented with the `websocket` feature.
+
+## Tensor Data Service
+
+The tensor data service provides easy utilities to share tensors peer-to-peer.
+One peer can expose a tensor, and another can download it. Each peer is both a client and a server.