Add AST2500 Layer README

Change-Id: I2d07f675997efeb1ec2d1d764bb4874fdf188a93
Signed-off-by: Gunnar Mills <gmills@us.ibm.com>
diff --git a/meta-openbmc-machines/meta-evb/meta-evb-aspeed/meta-evb-ast2500/README.md b/meta-openbmc-machines/meta-evb/meta-evb-aspeed/meta-evb-ast2500/README.md
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+ASPEED AST2500 Evaluation Board
+================
+
+This is the ASPEED AST2500 evaluation board 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).