Document default mining algo and how to use RandomX

docs.md

@@ -76,6 +76,12 @@ To create a Hush Smart Chain with z2z (shielded transactions only) you add the `
 
 Remember to use the exact same parameters on both nodes, or they will not be able to connect to each other, because they will be different, incompatible blockchains. All parameters that start with `-ac_` must match exactly for the same RPC port and other details to match.
 
+By default, a Proof-of-Work algorithm of Equihash (200,9) is used, which is compatible with existing ASICs that are used to mine HUSH, ZEC, ZEN and a few other cryptocoins. To use a CPU mining algorith, use randomx like this:
+
+```bash
+./hush-smart-chain -ac_name=LULZ -ac_private=1 -ac_algo=randomx -ac_supply=55555 &
+```
+
 **For other -ac_ parameters to use with your Hush Smart Chain, refer to [hsc-options-explained.md](hsc-options-explained.md).**
 
 ### Verify the Response