docs: add Payjoin capability to the README

Author: mehmetefeumit

README.md

@@ -35,6 +35,7 @@ And yes, it can do Taproot!!
 This crate can be used for the following purposes:
  - Instantly create a miniscript based wallet and connect to your backend of choice (Electrum, Esplora, Core RPC, Kyoto etc) and quickly play around with your own complex bitcoin scripting workflow. With one or many wallets, connected with one or many backends.
  - The `tests/integration.rs` module is used to document high level complex workflows between BDK and different Bitcoin infrastructure systems, like Core, Electrum and Lightning(soon TM).
+ - Receive and send Async Payjoins. Note that even though Async Payjoin as a protocol allows the receiver and sender to go offline during the payjoin, the BDK CLI implementation currently does not support persisting.
  - (Planned) Expose the basic command handler via `wasm` to integrate `bdk-cli` functionality natively into the web platform. See also the [playground](https://bitcoindevkit.org/bdk-cli/playground/) page.
 
 If you are considering using BDK in your own wallet project bdk-cli is a nice playground to get started with. It allows easy testnet and regtest wallet operations, to try out what's possible with descriptors, miniscript, and BDK APIs. For more information on BDK refer to the [website](https://bitcoindevkit.org/) and the [rust docs](https://docs.rs/bdk_wallet/1.0.0/bdk_wallet/index.html)
@@ -112,6 +113,18 @@ To generate a new extended master key, suitable for use in a descriptor:
 cargo run -- key generate
 ```
 
+To start a Payjoin session as the receiver with regtest RPC and example OHTTP relays:
+
+```
+cargo run --features rpc -- wallet --wallet sample_wallet --url="127.0.0.1:18443" --ext-descriptor "wpkh(tprv8ZgxMBicQKsPd2PoUEcGNDHPZmVWgtPYERAwMG6qHheX6LN4oaazp3qZU7mykiaAZga1ZB2SJJR6Mriyq8MocMs7QTe7toaabSwTWu5fRFz/84h/1h/0h/0/*)#8guqp7rn" receive_payjoin --amount 21120000 --max_fee_rate 1000 --directory "https://payjo.in" --ohttp_relay "https://pj.bobspacebkk.com" --ohttp_relay "https://pj.benalleng.com"
+```
+
+To send a Payjoin with regtest RPC and example OHTTP relays:
+
+```
+cargo run --features rpc -- wallet --wallet sample_wallet --url="127.0.0.1:18443" --ext-descriptor "wpkh(tprv8ZgxMBicQKsPd2PoUEcGNDHPZmVWgtPYERAwMG6qHheX6LN4oaazp3qZU7mykiaAZga1ZB2SJJR6Mriyq8MocMs7QTe7toaabSwTWu5fRFz/84h/1h/0h/0/*)#8guqp7rn" send_payjoin --ohttp_relay "https://pj.bobspacebkk.com" --ohttp_relay "https://pj.benalleng.com" --fee_rate 1 --uri "<URI>"
+```
+
 ## Justfile
 
 We have added the `just` command runner to help you with common commands (during development) and running regtest `bitcoind` if you are using the `rpc` feature.