Add AST2400 BSP Layer README

Change-Id: I0f8a18e9dece67f122b059b73f6bc1147255f5d5
Signed-off-by: Gunnar Mills <gmills@us.ibm.com>
diff --git a/meta-ast2400/README.md b/meta-ast2400/README.md
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+ASPEED AST2400
+================
+
+This is the ASPEED AST2400 Board Support Package (BSP) layer.
+The AST2400 is an ARM, service management SOC made by ASPEED. More information
+about the AST2400 can be found
+[here](https://www.aspeedtech.com/products.php?fPath=20&rId=376).
+This layer should be included for all OpenBMC systems that use the AST2400.