BLOG-43 docs: readme document for backend start

backend/README.md

@@ -0,0 +1,42 @@
+# Backend
+
+## Development
+
+### SQL Migration
+
+1. Install sqlx
+
+   ```bash
+   cargo install sqlx-cli
+   ```
+
+2. Run migration
+
+   ```bash
+   sqlx migrate run
+   ```
+
+### Run Project
+
+1. Prepare for sql schema setup
+
+   ```bash
+   cargo sqlx prepare --workspace
+   ```
+
+2. Run the server
+
+   ```bash
+   RUST_LOG=debug cargo run
+   ```
+
+3. (Optional) Hot restart
+
+   1. Install `watchexec`
+
+   2. Run the server with `watchexec`
+
+      ```bash
+      RUST_LOG=debug watchexec -e rs -r 'cargo run'
+      ```
+