Create directory to put power device firmware

The purpose of this directory to store power device firmware images. The
images will be  flashed to power device.

Change-Id: Ifdb1381ecdb02e0f0e1edfa62e010251029a068a
Signed-off-by: Faisal Awada <faisal@us.ibm.com>
diff --git a/device-images/README.md b/device-images/README.md
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+# Power device firmware images
+
+The goal of this directory is to store power device firmware images. Typically
+the firmware image will be flashed to the power device to enable the hardware to
+continue to operate efficiently, to fix performace issues, or to fix existing
+firmware bugs.