add README and CHANGELOG

CHANGELOG.md

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+# Changelog
+
+## [0.8.0] - 2023-09-28
+
+### Added
+
+- Blind signing feature
+- PPID feature
+- `domain` parameter to `derive_proof` and `verify_proof`
+- Allow inclusion of committed secrets in VP, generated by `derived_proof`, for using VP as an issuance request for bound VC
+- Helper functions for mutual conversion between ark object and multibase
+- Set current datetime for `created` if not provided
+- Type aliases to abstract cryptographic structs like `Bls12_381`, `SignatureParamsG1`, and so forth
+
+### Changed
+
+- Rename `nonce` to `challenge`
+- Modify `sign`, `sign_string`, `blind_sign`, `blind_sign_string` to generate the entire proof, not just the proof value
+- Simplify serialization and deserialization of proofValue (`ProofWithIndexMap`) and serialization of proof spec context (`ProofSpecContext`)

README.md

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+# rdf-proofs
+
+**WORK IN PROGRESS**
+
+This library enables the attachment of BBS+ signatures to RDF graphs to create Verifiable Credentials.
+It allows for the combination of multiple Verifiable Credentials and provides the capability to selectively disclose specific parts, resulting in the generation of a Verifiable Presentation as an RDF dataset.
+Internally, it utilizes the BBS+ signature library and the proof-system library from [docknetwork/crypto](https://github.com/docknetwork/crypto).
+Note that this is still in an experimental phase and is not suitable for practical use.
+
+## Usage
+
+TBD