js: Add more API and README

js/README.md

@@ -0,0 +1,43 @@
+# Library for KernelSU's module WebUI
+
+## Install
+
+```sh
+yarn add kernelsu
+```
+
+## API
+
+### exec
+
+Execute a command in the **root** shell.
+
+options:
+
+- `cwd` - Current working directory of the child process
+- `env` - Environment key-value pairs
+
+```javascript
+import { exec } from 'kernelsu';
+
+const { stdout, stderr } = await exec('ls -l', { cwd: '/tmp'});
+console.log(stdout);
+```
+
+### fullScreen
+
+Request the WebView enter/exit full screen.
+
+```javascript
+import { fullScreen } from 'kernelsu';
+fullScreen(true);
+```
+
+### toast
+
+Show a toast message.
+
+```javascript
+import { toast } from 'kernelsu';
+toast('Hello, world!');
+```