galileorevh.md: add initial revH doc

Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>

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+Galileo Rev H                           {#galileorevh}
+=============
+
+Galileo is a microcontroller board based on the Intel® Quark SoC X1000
+Application Processor, a 32-bit Intel Pentium-class system on a chip.
+
+The rev H board has the following limitations in libmraa:
+
+- i2c is set at 400Khz speed cannot be changed without reloading kernel module
+- i2c bus is shared with multiple devices, scanning it usually fails
+- pwm period is set globally for all pwm channels, when changed this will halt
+  all pwm channels