Add README.md

Readme.md

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+Setup:
+    Install SAMD boards in Arduino IDE
+    Install Arduino Low Power
+    Install TemperatureZero
+    Install libraries from MultiNode/Libraries
+    Upload MultiNode/MultiNode.ino
+
+RasPi:
+    # Install https://www.airspayce.com/mikem/bcm2835/ on Raspberry Pi
+    sudo apt-get install pip
+    pip install numpy pyLoraRFM9x pyblake2 toml
+
+    C++ programs need to be executed with sudo, or set permissions to use bcm2835 as user
+
+    Execute RasPi/RXTest.py