Merge #725

725: Add note to readme that --testnet swaps on monero stagenet r=rishflab a=rishflab

Remake of #708 

Co-authored-by: jerzybrzoska <51721153+jerzybrzoska@users.noreply.github.com>

docs/cli/README.md

@@ -8,6 +8,8 @@ To do that, pass the `--testnet` flag with the actual command:
 swap --testnet <SUBCOMMAND>
 ```
 
+Take note that applying `--testnet` results in transacting on Bitcoin testnet and on Monero stagenet, not on Monero testnet.
+
 The two main commands of the CLI are:
 
 - `buy-xmr`: for swapping BTC to XMR with a particular seller