add some READMEs

Signed-off-by: Eugene Crosser <evgenii.cherkashin@profitbricks.com>

diff --git a/README.md b/README.md
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+= LED strip light controller =
+
+The project is to drive night lighting of a staircase using PIR
+motion sensors (two: for the top and bottom of the staircase).
+Ambiant light sensor to only turn the LED chains when it is dark.
+Driven by MSP430 MCU, light power controlled via PWM + MOSFET.

diff --git a/hardware/README b/hardware/README
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+Using this suggestion from electronics stackexchange:
+
+https://electronics.stackexchange.com/questions/67775/driving-led-strip-from-microcontroller
+
+MOSFET datasheet:
+
+https://www.infineon.com/dgdl/irlml2502.pdf?fileId=5546d462533600a401535667f44d2602
+