Merge bitcoindevkit#1573: chore: add missing bdk_core README.md and r…

…emove specific bdk_chain dev version

48b6a66 chore(core): remove bdk_chain dev-dependency version (Steve Myers)
9bd500f chore(core): add missing README.md (Steve Myers)

Pull request description:

  Add the missing README.md file for the bdk_core crate. This is required to publish to crates.io.

  Also had to removed fixed bdk_chain version from bdk_core dev dependencies to prevent missing dependency when publishing bdk_core before publishing new version of bdk_chain.

ACKs for top commit:
  ValuedMammal:
    ACK 48b6a66

Tree-SHA512: 5fb31984f79771c5366ca078efa11330b24fd4d97e90531a2ba8f92ce6361c6dd4f123e8640269de9235bc5ebf3e6b5ced261e36f5b40f01db3f82add9a5ae68

crates/core/Cargo.toml

@@ -21,4 +21,4 @@ std = ["bitcoin/std"]
 serde = ["dep:serde", "bitcoin/serde", "hashbrown?/serde"]
 
 [dev-dependencies]
-bdk_chain = { version = "0.18.0", path = "../chain" }
+bdk_chain = { path = "../chain" }

crates/core/README.md

@@ -0,0 +1,3 @@
+# BDK Core
+
+This crate is a collection of core structures used by the bdk_chain, bdk_wallet, and bdk chain data source crates.