message: README: Add note about Starlark VS Code
  Summary:
  Clarify that `npm install` is needed for debugging _and_ installing, rather than _just_ debugging.
  Explicitly clarify npm v7+ is required.
diff: @@ -6,9 +6,13 @@ Based on a combination of:
  * Code for the tutorial at https://github.com/microsoft/vscode-extension-samples/tree/master/lsp-sample
  * Syntax files from https://github.com/phgn0/vscode-starlark (which are the Microsoft Python ones with minor tweaks)
  +## Pre-requisites
  +
  +You need to have npm v7+ installed. Afterwards, run `npm install` in this folder.
  +
  ## Debugging
  -- Run `npm install` in this folder. This installs all necessary npm modules in both the client and server folder
  +- Follow steps in Pre-requisites section.
  - Open VS Code on this folder.
  - Press Ctrl+Shift+B to compile the client and server.
  - Switch to the Debug viewlet.
  @@ -17,7 +21,8 @@ Based on a combination of:
  ## Installing
  +- Follow steps in Pre-requisites section.
  - Run `npm install vsce`
  - Run `npm exec vsce package`
  -- In VS Code, go to Extensions, ..., Install from VSIX and select `starlark-1.0.0.vsix`
  -- Build Starlark binary and put it on your `$PATH`, e.g. `cd buck2 && cargo build --bin=starlark && cp $CARGO_TARGET_DIR/debug/starlark ~/.cargo/bin/starlark`.
  +- In VS Code, go to Extensions, click on the "..." button in the Extensions bar, select "Install from VSIX" and then select the `starlark-1.0.0.vsix` file.
  +- Build Starlark binary and put it on your `$PATH`, e.g. `cargo build --bin=starlark && cp $CARGO_TARGET_DIR/debug/starlark ~/.cargo/bin/starlark`.
  