doc: Expand documentation on asmap feature and tooling

contrib/README.md

@@ -18,6 +18,9 @@ A Linux bash script that will set up traffic control (tc) to limit the outgoing
 ### [Seeds](/contrib/seeds) ###
 Utility to generate the pnSeed[] array that is compiled into the client.
 
+### [ASMap](/contrib/asmap) ###
+Utilities to analyze and process asmap files.
+
 Build Tools and Keys
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