Add RaZberry Z-Wave transceiver board

draft/overlay/razberry.md

@@ -0,0 +1,30 @@
+<!--
+---
+name: RaZberry
+class: board
+type: iot,radio
+formfactor: Custom
+manufacturer: Z-Wave.Me
+description: Z-Wave transceiver module for Raspberry Pi
+url: https://z-wave.me/products/razberry/
+image: 'razberry.png'
+pincount: 10
+eeprom: no
+power:
+  '1':
+ground:
+  '6':
+  '9':
+pin:
+  '8':
+    mode: uart
+  '10':
+    mode: uart
+-->
+#RaZberry
+
+RaZberry hosts a Sigma Designs ZM5101 Z-Wave transceiver module (a so called 5th generation Z-Wave module), an external 32 K SPI flash for network data and a PCBA antenna. Additionally two LEDs are used to indicate certain status of the Z-Wave controller chip. Beside the PCBA antenna there is an option to solder a U.FL connector for external SMA antenna.
+
+The power consumption of the board is typically 18 mA at 3.3 V but can peak up to 40 mA when the chip is transmitting.
+
+RaZberry supports Z-Wave Security S2 and Smart Start technologies.