Update CHANGELOG for 0.1.0 release.

CHANGELOG.md

@@ -7,4 +7,15 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Unreleased
 
-New version for RP235x. Based on RP2040 version.
+* No changes
+
+## [0.1.0] 2024-08-18 ([Crates.io](https://crates.io/crates/rp235x-pac/0.1.0) | [Github](https://github.com/rp-rs/rp235x-pac/releases/tag/v0.1.0))
+
+### Added
+
+* New version for RP235x.
+  * Taken from https://github.com/thejpster/rp-hal-rp2350-public/tree/main/rp235x-pac, which was never published to crates.io
+  * Builds for Arm (`thumbv8m.main-none-eabihf`) and RISC-V (`riscv32imac-unknown-none-elf`)
+
+[Unreleased]: https://github.com/rp-rs/rp235x-pac/compare/v0.1.0...HEAD
+[0.1.0]: https://github.com/rp-rs/rp235x-pac/releases/tag/v0.1.0