message: Update readme.
  Original commit:
diff: @@ -28,21 +28,26 @@ rustup component add clippy # Install the linter.
  ## Building and testing the project
  -Please use the `build.sh` script. We need to use a simple custom wrapper here
  -because of the following Rust toolchain issues:
  +Please use the `script/build.sh`, `script/watch.sh`, and `script/lint.sh`
  +scripts to build, watch, and lint the project respectively. We need to use a
  +simple custom wrappers here because of the several Rust toolchain issues:
  - [No direct support for Cargo Workspaces in
  -wasm-pack.](https://github.com/rustwasm/wasm-pack/issues/642)
  +wasm-pack.](https://github.com/rustwasm/wasm-pack/issues/642). Fixed in
  +`build.sh`.
  - There is no watch utility in wasm-pack, which makes using it harder than it
  -should be.
  +should be. Fixed in `watch.sh`.
  +- [The commands cargo-check and cargo-clippy do not clean local cache if used
  +several times.](https://github.com/rust-lang/cargo/issues/6986). Fixed in
  +`lint.sh`.
  -In order to build and test the project, please use the following commands:
  +In order to build an example demo scene, please use the following commands:
  ```bash
  -./build.sh
  +./script/watch.sh # Build and watch for changes.
  # Wait till the project finishes building.
  -# Run the following lines from other cmd.
  +# Run the following lines from other cmd:
  cd examples/01-scene
  npm install
  