Update README.md

Author: DanielSSilva

README.md

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-# Powershell_IoT_IS31FL3730-Driver
+# PowerShell-IoT - IS31FL3730 Driver
 
 This repository has as main objective, replicate the [pimoroni's IS31FL3730 driver](https://github.com/pimoroni/scroll-phat/blob/master/library/scrollphat/IS31FL3730.py) to the PowerShell environment, using [PowerShell-IoT](https://github.com/PowerShell/PowerShell-IoT).
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+If you don't have PowerShell installed on your Raspberry, follow [this guide](https://github.com/PowerShell/PowerShell/blob/master/docs/installation/linux.md#raspbian) to do so.
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+After that, you need to install [PowerShell-IoT Module](https://github.com/PowerShell/PowerShell-IoT#installation)
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+Any suggestion/contribution is really welcome!