Merge bitcoindevkit/bdk#1085: docs: Update README.md

2263a58448f5f04a74e076132aea93f21c584bc0 refactor: Rename `wallet_esplora` to... ...`wallet_esplora_blocking` (Daniela Brozzoni)
11ac26f6b28b6694dfc04e9fc72c208e454632c7 docs: Update README.md (Daniela Brozzoni)

Pull request description:

  ### Description

  - Fixes the release timeline
  - Adds an explanation for the crates under `example-crates`

  ### Checklists

  #### All Submissions:

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

ACKs for top commit:
  notmandatory:
    ACK 2263a58448f5f04a74e076132aea93f21c584bc0
  evanlinjin:
    ACK 2263a58448f5f04a74e076132aea93f21c584bc0

Tree-SHA512: fd0eecb4a1051b8f88ae858ad6231b254beaad50f925d656a307c66bd6a20770cf698032d1d7e0179d93ac169cfa5d8c7c3b8def4c91334afc27f7a6f9d7558a