libgpiod: add a simple README

Signed-off-by: Bartosz Golaszewski <bartekgola@gmail.com>

diff --git a/README b/README
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+    libgpiod - C library and tools for interacting with the linux GPIO
+               character device
+
+Since linux 4.7 the GPIO sysfs interface is deprecated. User space should use
+the character device instead. This library encapsulates the ioctl calls and
+data structures behind a straightforward API.
+
+This is still work-in-progress and no interfaces are stable yet.
+
+Contributions are welcome - please use github pull-requests and stick to the
+linux kernel coding style.