better startup instructions

README.md

@@ -9,19 +9,29 @@ This target allow to program a [BBC micro:bit](https://www.microbit.co.uk/) usin
 
 # Getting started
 
-Please follow instructions at https://github.com/Microsoft/pxt#running-a-target-from-localhost 
+The following commands are a 1-time setup after synching the repo on your machine.
+
+* install the PXT command line
+```
+npm install -g pxt
+```
+* install the dependencies
+```
+npm install
+```
+
+After you're done, simple run this command to open a local web server:
+```
+pxt serve
+```
+
+More instructions at https://github.com/Microsoft/pxt#running-a-target-from-localhost 
 
 ## Universal Windows App
 
 The Windows 10 app is a [Universal Windows Hosted Web App](https://microsoftedge.github.io/WebAppsDocs/en-US/win10/CreateHWA.htm)
 that wraps m.pxt.io and provides additional features.
 
-### Sideloading
-
-* Open Windows **settings** and search for **Developer options**
-* Enable the developer mode.
-* Find the latest build under ``win10/app/AppPackages/latest`` and run the ``Add-AppDevPackage.ps1`` PowerShell script (mouse right-click, then `run with PowerShell`)
-
 ### Building
 
 * Install Visual Studio 2015 Update 2 or higher. Make sure the Windows 10 templates are installed.