patch: add extra shorthand for cli

Author: pelikhan

cli/devsc

@@ -0,0 +1,2 @@
+#!/usr/bin/env node
+require('./built/devicescript-cli.cjs').mainCli()

website/docs/Dev/cli.md

@@ -1,2 +1,31 @@
 # Command Line Interface
 
+## Setup
+
+* install [Node.js](https://nodejs.org/en/download/)
+* install the CLI using npm or yarn
+
+```bash
+npm install -g devicescript
+```
+
+```bash
+corepack enable
+yarn add devicescript
+```
+
+The command tool is named `devicescript` or `devsc` for short.
+
+## Build
+
+The `build` command compiles the DeviceScript files in the current folder, using the resolution rules in `tsconfig.json`.
+
+```bash
+devsc build
+```
+
+This is the default command, so you can omit build.
+
+```bash
+devsc
+```