Add readme for arduino-spi

PUBLISHED_FROM=87c1036709911d7ab40c7c1d33a9e97c4d283c85
mongoose-os-libs · Dec 25, 2017 · 8002cdf · 8002cdf
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 # Arduino SPI library for Mongoose OS
+
+This library provides an Arduino compatibility layer for SPI by providing
+an `SPI.h` public header, so that one could pick an existing Arduino
+program which uses SPI, throw it into the Mongoose OS application sources,
+and ideally, it "just works".