docs: add changelog

CHANGELOG.md

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+## 0.1.1 (2023-02-06)
+
+- Introduced `merge_in_domain` for the RPO hash function, to allow using a specified domain value in the second capacity register when hashing two digests together.
+- Added a simple sparse Merkle tree implementation.
+- Added re-exports of Winterfell RandomCoin and RandomCoinError.
+
+## 0.1.0 (2022-12-02)
+
+- Initial release on crates.io containing the cryptographic primitives used in Miden VM and the Miden Rollup.
+- Hash module with the BLAKE3 and Rescue Prime Optimized hash functions.
+    - BLAKE3 is implemented with 256-bit, 192-bit, or 160-bit output. 
+    - RPO is implemented with 256-bit output.
+- Merkle module, with a set of data structures related to Merkle trees, implemented using the RPO hash function.