doc: added descriptions and images for current nodes n29-n30.

doc/mcu-examples/n30/README.md

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+
+N30
+===
+
+N30 is a ATtiny84 based PCB with a temperature sensor and
+connections for LED stripes.
+
+Currently there is a driver for SK6812 RGBW stripes. The node
+supports event driven light control (e.g. turn on light when
+some other devices sends a motion detect message).
+
+The PCB is prepared to support SPI-controlled LED-Strips as well,
+but for now there is no software support for this (have to write
+a driver for it).
+
+
+Overview
+--------
+
+- Role: LED strip controller
+- MCU: AtTiny84
+- Frequency: 8MHz
+- Connection: RJ45
+- Predecessor: N22, N16
+- COM: COM2W
+- Periphery:
+  - LED strip connection (SK6812)
+  - OWI interface
+    - DS18B20 temperature sensor
+- Apps:
+  - NETWORK:       Basic network functionality (address setup etc.)
+  - REPORTSENSORS: report sensor data from temperature sensor etc.
+  - STATS        : periodically send stats data
+  - MA_LIGHT     : motion activated light
+
+