message: docs: add "how to use" part
diff: # types-web
  +## How to use
  +
  +1. Install the package by `npm i types-web`.
  +2. Include the type files in your `tsconfig.json` or `jsconfig.json`:
  +
  + ```json
  + {
  + "includes": [
  + "node_modules/types-web/baselines/dom*"
  + "*"
  + ]
  + }
  + ```
  +
  + Or for web workers:
  +
  + ```json
  + {
  + "includes": [
  + "node_modules/types-web/baselines/dom*"
  + "*"
  + ]
  + }
  + ```
  +
  ## Build Instructions
  -To get things setup:
  +* To get things setup:
  ```sh
  -npm install
  + npm i
  ```
  -To generate the `.d.ts` files
  +* To generate the `.d.ts` files
  ```sh
  -npm run build
  + npm run build && npm run baseline-accept
  ```
  -To test:
  +* To test:
  ```sh
  -npm run test
  + npm test
  ```
  +
  +## Why not `@types`?
  +
  +To maintain the package by myself without waiting for external reviews.
  