Merge bitcoindevkit/bdk-cli#187: docs: update readme

Merge bitcoindevkit/bdk-cli#187: docs: update readme

96335ca801a76728751e2651dad715720ca2f8e8 docs: update readme (Vihiga Tyonum)

Pull request description:

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  ### Description

  Update readme document

  <!-- Describe the purpose of this PR, what's being adding and/or fixed -->

  <!-- In this section you can include notes directed to the reviewers, like explaining why some parts
  of the PR were done in a specific way -->

  <!-- Notice the release manager should include in the release tag message changelog -->
  <!-- See https://keepachangelog.com/en/1.0.0/ for examples -->

  ### 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

ACKs for top commit:
  notmandatory:
    ACK 96335ca801a76728751e2651dad715720ca2f8e8

Tree-SHA512: 9e13d2c322a3538406d07c752aa4a9391cd57670372b9f7ff9c16450629ee28edbf6a7380e61b9d539d2b384ebb4a4886b60deda3c48fe6fe074672fd64eba20