adding release notes for github-independent information [skip ci] (#65)

RELEASE.md

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+oqs-provider 0.4.0
+==================
+
+About
+-----
+
+The **Open Quantum Safe (OQS) project** has the goal of developing and prototyping quantum-resistant cryptography.  More information on OQS can be found on our website: https://openquantumsafe.org/ and on Github at https://github.com/open-quantum-safe/.  
+
+**oqs-provider** is a standalone prototype [OpenSSL 3](https://github.com/openssl/openssl) [provider](https://www.openssl.org/docs/manmaster/man7/provider.html) enabling [liboqs](https://github.com/open-quantum-safe/liboqs)-based quantum-safe and hybrid key exchange for TLS 1.3, as well as quantum-safe and hybrid X.509 certificate generation, CMS ond dgst operations. 
+
+When deployed, the `oqs-provider` binary (shared library) thus adds support for quantum-safe cryptographic operations to any standard OpenSSL(v3) installation.
+
+In general, the oqs-provider `main` branch is meant to be useable in conjunction with the `main` branch of [liboqs](https://github.com/open-quantum-safe/liboqs) and the `master` branch of [OpenSSL](https://github.com/openssl/openssl).
+
+Further details on building, testing and use can be found in [README.md](https://github.com/open-quantum-safe/oqs-provider/blob/main/README.md). See in particular limitations on intended use.
+
+Release notes
+=============
+
+This is version 0.4.0 of oqs-provider.
+
+Security considerations
+-----------------------
+
+This release removes Rainbow level 1 and all variants of SIDH and SIKE due to cryptanalytic breaks of those algorithms.  Users are advised to move away from use of those algorithms immediately.
+
+What's New
+----------
+
+This release continues from the 0.3.0 release of oqs-provider and is fully tested to be used in conjunction with version 0.7.2 of [liboqs](https://github.com/open-quantum-safe/liboqs). 
+
+oqs-provider has been integrated as an external test component for [OpenSSL3 testing](https://github.com/openssl/openssl/blob/master/test/README-external.md#oqsprovider-test-suite) and will thus remain in line with any possibly required provider API enhancements.
+
+### Algorithm updates
+
+- Removal of SIKE/SIDH and Rainbow level I due to cryptographic breaks
+
+### Functional updates
+
+- Addition of quantum-safe CMS operations via the [OpenSSL interface](https://www.openssl.org/docs/man3.0/man1/openssl-cms.html)
+- Addition of quantum-safe dgst operations via the [OpenSSL interface](https://www.openssl.org/docs/man3.0/man1/openssl-dgst.html)
+
+### Misc updates
+
+- Additional testing
+- Integration with and of OpenSSL test harness
+
+---
+
+**Full Changelog**: https://github.com/open-quantum-safe/oqs-provider/compare/0.3.0...0.4.0.