Add AST2500 BSP Layer README

Change-Id: I6d6d21aea6e96408b3458afd5ea971fcc968e7e1
Signed-off-by: Gunnar Mills <gmills@us.ibm.com>
diff --git a/meta-openbmc-bsp/meta-aspeed/meta-ast2500/README.md b/meta-openbmc-bsp/meta-aspeed/meta-ast2500/README.md
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+ASPEED AST2500
+================
+
+This is the ASPEED AST2500 Board Support Package (BSP) layer.
+The AST2500 is an ARM, service management SOC made by ASPEED. More information
+about the AST2500 can be found
+[here](https://www.aspeedtech.com/products.php?fPath=20&rId=440).
+This layer should be included for all OpenBMC systems that use the AST2500.