doc: update README

README.md

@@ -1,39 +1,99 @@
 # Yet Another WebADB
 
-Connect to your Android phones from everything that can run (supported) web browser, including PC, mac, and even another Android phone.
+Connect to your Android phones from any (supported) web browsers, even from another Android phone.
 
-Inspired by [webadb.js](https://github.com/webadb/webadb.js), but completely rewritten.
+Try it online at https://yume-chan.github.io/ya-webadb
 
 ## How does it work
 
-Currently only the interactive shell (`adb shell`) is implemented, but I think it's the most difficult but interesting part.
+[WebUSB](https://wicg.github.io/webusb) API allow JavaScript to communicate with connected USB devices, including Android phones.
 
-WebUSB API gives JavaScript running in supported web browsers access to USB devices, including Android phones.
+ADB uses a fairly simple protocol, so it's pretty easy to reimplement with JavaScript.
 
-ADB uses a fairly simple protocol to communicate, so it's pretty easy to reimplement with JavaScript.
+`adb shell`, the interactive shell, uses the PTY protocol, and [xterm.js](https://github.com/xtermjs/xterm.js/) can handle it very well.
 
-`adb shell`, the interactive shell, uses plain PTY protocol, and [xterm.js](https://github.com/xtermjs/xterm.js/) can handle it very well.
+## Packages
+
+This repository is a monorepo containing following packages:
+
+| Folder Name    | Package Name          | Description                  |
+|----------------|-----------------------|------------------------------|
+| event          | `@yume-chan/event`      | Provides an EventEmitter pattern. Ready to be published to npm |
+| adb            | `@yume-chan/adb`        | Provides platform-independent ADB logic implemented in TypeScript, requires a [backend](#backend) to work. Ready to be published to npm |
+| adb-webusb     | `@yume-chan/adb-webusb` | Provides a Web API powered backend for `@yume-chan/adb`. Ready to be published to npm |
+| webpack-config | -                       | Webpack configuration file in TypeScript, will output into `demo` folder |
+| demo           | -                       | A sample website demonstrating usage of `@yume-chan/adb` and `@yume-chan/adb-webusb` packages |
+
+## Backend
+
+`@yume-chan/adb` isn't tied to a specific transfer API. In fact it doesn't use any Web-only API, so with a proper backend it may also be able to run on Node.js or Electron.
+
+A backend needs to provide these functions:
+
+1. Data transferring. For example using the WebUSB API.
+2. Private key storage and generation. For example using the LocalStorage and WebCrypto API.
+3. UTF-8 string encoding and decoding. For example using the `TextEncoder` and `TextDecoder` API.
 
 ## Build
 
+### Pre-requirements
+
+First, install all dependencies:
+
+```shell
+npm i
+```
+
+or if you already have `lerna` installed, run
+
+```shell
+lerna bootstrap
+```
+
+### Build npm packages
+
+To build `@yume-chan/event`, `@yume-chan/adb` and `@yume-chan/adb-webusb`, run
+
 ```shell
 npm run build
 ```
 
-## Run
+Or you can `cd` into each folder and run
 
 ```shell
-npm start
+npm run build
 ```
 
-And navigate to `http://localhost:8080/test.html`.
+All packages have TypeScript project references configured so building one package will automatically build dependency packages too.
+
+### Watch npm packages
+
+To watch changes and rebuild, run
+
+```shell
+npm run build:watch
+```
+
+### Run demo
+
+Build or watch npm packages first, then run
+
+```shell
+npm run start:demo
+```
+
+to start the webpack dev server for the `demo` package.
+
+Now navigate to `http://localhost:9000`.
+
+#### Note
 
 WebUSB API requires a [secure context](https://developer.mozilla.org/en-US/docs/Web/Security/Secure_Contexts) (basically means HTTPS).
 
-Chrome will treat `localhost` as one, but if you want to access test server running on another machine, you can configure you Chrome as following:
+Chrome will treat `localhost` as secure, but if you want to access a dev server running on another machine, you need to add the domain to excepts:
 
 1. Open `chrome://flags/#unsafely-treat-insecure-origin-as-secure`
-2. Add the protocol and domain part of your url (e.g. `http://192.168.0.100:8080`) to the input box
+2. Add the protocol and domain part of your url (e.g. `http://192.168.0.100:9000`) to the input box
 3. Choose `Enable` from the dropdown menu
 4. Restart your browser