Add OpenBMC Layer README

Change-Id: I67d3c2b48ad4786b51a0c085f2ca4db6e53ddc9e
Signed-off-by: Gunnar Mills <gmills@us.ibm.com>
diff --git a/README.md b/README.md
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+OpenBMC
+================
+
+meta-phosphor is the OpenBMC layer. This layer should be included for all
+OpenBMC systems. The OpenBMC layer contains content which is shared between all
+OpenBMC systems.