Add OpenBMC BSP Layer README

Change-Id: I0ad9cd55f4320b63ff08417a1e546ca9517810d1
Signed-off-by: Gunnar Mills <gmills@us.ibm.com>
diff --git a/meta-openbmc-bsp/README.md b/meta-openbmc-bsp/README.md
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+OpenBMC Board Support Package (BSP)
+================
+
+This is the OpenBMC Board Support Package (BSP) layer.
+A Board Support Package (BSP) is a collection of information that defines how
+to support a particular hardware device, set of devices, or hardware platform.
+The OpenBMC BSP layer includes the service management SOCs, such as ASPEED's
+AST2500.