Add code formatting guidelines

docs/manual/98_contributing/05_source/60_codeFormatting.md

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+# Code Formatter
+
+We use prettier to format our code.
+
+## Format on Save
+
+### Setting Up Prettier in VS Code
+
+1. **Install Prettier Extension (if not already installed):**
+   - Press `Ctrl` + `P` to open the command palette.
+   - Type `ext install esbenp.prettier-vscode` and press `Enter`.
+   - Follow the prompts to install the Prettier extension.
+
+2. **Open Settings:**
+   - Press `Ctrl` + `,` together to open the VS Code settings.
+
+3. **Enable Format on Save:**
+   - In the search bar at the top, type `Format on Save`.
+   - You will see three tabs: User, Remote, and Workspace.
+   - Check the box next to `Editor: Format on Save` under both User and Remote tabs. **Do not check the box under the Workspace tab.**
+
+4. **Set Prettier as Default Formatter:**
+   - Open any file in your workspace.
+   - Right-click within the file editor.
+   - Select `Format Document With...`.
+   - Choose `Configure Default Formatter...`.
+   - Select `Prettier - Code Formatter` from the list.
+
+
+
+### Verifying Your Setup
+
+1. **Test Format on Save:**
+   - Open a file with some unformatted code.
+   - Make a small edit and save the file (`Ctrl` + `S`).
+   - Verify that the code is automatically formatted upon saving.
+
+By following these steps, you ensure that Prettier is set up as the default code formatter and that formatting occurs automatically on save, reducing formatting issues across the team.