add package description

Author: larskuhtz

chainweb-mining-client.cabal

@@ -1,5 +1,17 @@
 cabal-version: 3.0
 name: chainweb-mining-client
+description:
+    A mining client for Kadena Chainweb. It supports
+    .
+    * multi threaded CPU mining,
+    * external mining workers (e.g. a GPU),
+    * simulated mining for testing.
+    .
+    Competitive mining on the Kadena Chainweb Mainnet requires special mining
+    hardware, which usually comes with its own mining client and mining pool
+    support implementations. This generic mining client is intended mostly for
+    testing.
+
 version: 0.2
 synopsis: Mining Client for Kadena Chainweb
 homepage: https://github.com/kadena-io/chainweb-mining-client