Merge #300: docs: update cargo features in README to match Cargo.toml

047bbbe docs: update sp code key params in docs example (Vihiga Tyonum)
4a1ff1b docs: update cargo feature flags in README to match Cargo.toml (musab1258)

Pull request description:

  <!-- You can erase any parts of this template not applicable to your Pull Request. -->

  ### Description

  The README referenced outdated cargo feature flags `kyoto` and `sp`, which will cause build failures for users following the instructions. This commit updates the documentation to use the correct flags `cbf` and `silent-payments` as defined in the current `Cargo.toml`.

  Fixes #299

  ### Notes to the reviewers

  This is a documentation update to the `README.md`. I specifically left the reference to `Kyoto` in the "About" section intact, as it correctly refers to the underlying `bdk_kyoto` library/concept, and only updated the actual Cargo feature flags in the code blocks and feature lists.

  ## Changelog notice

  * Fixed outdated cargo feature flags (`kyoto` -> `cbf` and `sp` -> `silent-payments`) in the README instructions.

  ### Checklists

  #### All Submissions:

  * [x] I've signed all my commits
  * [x] I followed the [contribution guidelines](https://github.com/bitcoindevkit/bdk-cli/blob/master/CONTRIBUTING.md)
  * [x] I ran `cargo fmt` and `cargo clippy` before committing

  #### Bugfixes:

  * [ ] This pull request breaks the existing API
  * [ ] I've added tests to reproduce the issue which are now passing
  * [x] I'm linking the issue being fixed by this PR

Top commit has no ACKs.

Tree-SHA512: 680ff0f96eab3b28585beaf4d6be89c05985edaf61369207fe2d9ac3722a9d8b69fd898885e13847117f8b5481bbf16b0642506321558f08167c2f6f554bfd12

Author: tvpeter

README.md

@@ -47,7 +47,7 @@ bdk-cli can be compiled with different features to suit your experimental needs.
   - Blockchain Client Options
      - `esplora` : Connects the wallet to an esplora server.
      - `electrum` : Connects the wallet to an electrum server.
-     - `kyoto`: Connects the wallet to a kyoto client and server.
+     - `cbf`: Connects the wallet to a kyoto client and server.
      - `rpc`: Connects the wallet to Bitcoind server.
   - Extra Utility Tools
      - `repl` : use bdk-cli as a [REPL](https://codewith.mu/en/tutorials/1.0/repl) shell (useful for quick manual testing of wallet operations).
@@ -89,7 +89,7 @@ RUST_LOG=debug cargo run --features electrum -- wallet -w testnetwallet balance
 ```
 
 Available blockchain client features are:
-`electrum`, `esplora`, `kyoto`, `rpc`.
+`electrum`, `esplora`, `cbf`, `rpc`.
 
 ### From crates.io
 
@@ -161,18 +161,18 @@ cargo run --features rpc -- wallet --wallet payjoin_wallet2 send_payjoin --ohttp
 
 To experiment with silent payments, you can get two public keys in compressed or uncompressed format, `A1` and `A2`, and produce a silent payment code by calling:
 ```shell
-cargo run --features sp -- --network signet silent_payment_code --scan_public_key '<A1>' --spend_public_key '<A2>'
+cargo run --features silent-payments -- --network signet silent_payment_code --scan_key '<A1>' --spend_key '<A2>'
 ```
 
 Once you have a silent payment code, `SP_CODE_1` and an amount `AMOUNT_1` to send, you can create a valid transaction locking funds to a silent payment code derived address with the following command:
 
 ```shell
-cargo run --features electrum,sp -- --network testnet4 wallet --wallet sample_wallet --ext-descriptor "wpkh(tpubEBr4i6yk5nf5DAaJpsi9N2pPYBeJ7fZ5Z9rmN4977iYLCGco1VyjB9tvvuvYtfZzjD5A8igzgw3HeWeeKFmanHYqksqZXYXGsw5zjnj7KM9/*)" --database-type sqlite --client-type electrum --url "ssl://mempool.space:40002" create_sp_tx --to-sp <SP_CODE_1>:<AMOUNT_1>
+cargo run --features electrum,silent-payments -- --network testnet4 wallet --wallet sample_wallet --ext-descriptor "wpkh(tpubEBr4i6yk5nf5DAaJpsi9N2pPYBeJ7fZ5Z9rmN4977iYLCGco1VyjB9tvvuvYtfZzjD5A8igzgw3HeWeeKFmanHYqksqZXYXGsw5zjnj7KM9/*)" --database-type sqlite --client-type electrum --url "ssl://mempool.space:40002" create_sp_tx --to-sp <SP_CODE_1>:<AMOUNT_1>
 ```
 
 It's also possible to drain all balance to a silent payment wallet by using the `--send_all` flag:
 ```shell
-cargo run --features electrum,sp -- --network testnet4 wallet --wallet sample_wallet --ext-descriptor "wpkh(tpubEBr4i6yk5nf5DAaJpsi9N2pPYBeJ7fZ5Z9rmN4977iYLCGco1VyjB9tvvuvYtfZzjD5A8igzgw3HeWeeKFmanHYqksqZXYXGsw5zjnj7KM9/*)" --database-type sqlite --client-type electrum --url "ssl://mempool.space:40002" create_sp_tx --send_all --to-sp <SP_CODE_1>:0
+cargo run --features electrum,silent-payments -- --network testnet4 wallet --wallet sample_wallet --ext-descriptor "wpkh(tpubEBr4i6yk5nf5DAaJpsi9N2pPYBeJ7fZ5Z9rmN4977iYLCGco1VyjB9tvvuvYtfZzjD5A8igzgw3HeWeeKFmanHYqksqZXYXGsw5zjnj7KM9/*)" --database-type sqlite --client-type electrum --url "ssl://mempool.space:40002" create_sp_tx --send_all --to-sp <SP_CODE_1>:0
 ```
 
 ### Payjoin