Updates Readme with some installation instructions

README.md

@@ -11,6 +11,15 @@ Note: The flash storage is reset every time you upload a new sketch to your Ardu
 
 Inspiration and some code from Pansenti at https://github.com/Pansenti/DueFlash
 
+## Install
+Arduino.cc has some good instructions on how to add libraries:
+https://www.arduino.cc/en/Guide/Libraries
+
+The easiest is just to open the library manager and search for "DueFlashStorage". Install the one from Sebastian Nilsson.
+
+Remember that you also need to install the Arduino SAM Boards from the board manager:
+https://www.arduino.cc/en/Guide/Cores
+
 ## Use
 ### Basic use
 ```cpp
@@ -59,4 +68,4 @@ Try resetting the Arduino Due or unplug the power to it. The values will stay st
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 [![Flattr this git repo](http://api.flattr.com/button/flattr-badge-large.png)](https://flattr.com/submit/auto?user_id=sebnil&url=https://github.com/sebnil/DueFlashStorage)
 
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