Update README.md

Author: ryota-murakami

README.md

@@ -70,7 +70,12 @@ after that auto launch todo app on your default browser and code edit ready.
 - [Github Actions](https://github.com/features/actions): Automation run tests, lint, typecheck, build
 - [Depfu](https://depfu.com/github/ryota-murakami/react-typescript-todomvc-2022?project_id=9618): Keep latest npm packages automaticaly
 
-## 👩‍💻 Usage
+## Command
+
+You can do exact same command with npm, or [install yarn](https://classic.yarnpkg.com/en/docs/install#mac-stable) easily if you have interest.
+
+### `yarn` or `yarn install`
+Install all Node Package Modules that depending this project.
 
 ### `yarn start`
 
@@ -82,6 +87,9 @@ and then you'll got todo app as same as Demo. let's modify under the `src/` code
 
  Production build that bundled optimization stuff in `build` directory.
 
+### `yarn serve`
+
+Run production build that generated by `yarn build`.
 
 ### `yarn lint`
 
@@ -103,6 +111,14 @@ Check TypeScript error whole porject.
 Run [Jest](https://jestjs.io/).  
 Using [react-testing-library](https://github.com/testing-library/react-testing-library) for component integration testing.
 
+### `yarn clean`
+
+Delete `node_modules/*`, `yarn.lock`, `build/*` once.
+
+### `yarn prettier`
+
+Run prettier formatting holeproject without all JS/TS files.
+
 ### `yarn cypress:open`
 
 [Cypress](https://www.cypress.io/) is all-in-one E2E Testing tool which can deal testing on real browser.