Add README.md and LICENSE

LICENSE

+The MIT License
+
+Copyright (c) 2020-2024 Olaf Bergmann <bergmann@tzi.org>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
\ No newline at end of file

README.md

+dcaf: Authenticated Authorization for the Internet of Things
+
+Copyright (c) 2015—2024 by Olaf Bergmann <bergmann@tzi.org>
+              2015—2024 by Stefanie Gerdes <gerdes@tzi.org>
+
+ESP-IDF component for the DTLS profile RFCs
+[9202](https://www.rfc-editor.org/rfc/rfc9202) and
+[9430](https://www.rfc-editor.org/rfc/rfc9430) on Authentication and
+Authorization for Constrained Environments (ACE, 
+[RFC 9200](https://www.rfc-editor.org/rfc/rfc9200) with
+optional DCAF extensions.
+
+ABOUT DCAF
+==========
+
+The Delegated CoAP Authentication and Authorization Framework (DCAF)
+defines an architecture and a protocol for delegating client
+authentication and authorization in a constrained environment for
+establishing a secure communication context between
+resource-constrained nodes, utilizing Datagram Transport Layer
+Security (DTLS) or CBOR message syntax (COSE). 
+
+The protocol transfers authorization information and shared secrets
+for symmetric cryptography between entities in a constrained
+network. A resource-constrained node can use the protocol to delegate
+authentication of communication peers and management of authorization
+information to a trusted host with less severe limitations regarding
+processing power and memory.
+
+More information on DCAF is available at https://dcaf.science
+
+LICENSE INFORMATION
+===================
+
+This library is published as open-source software without any warranty
+of any kind. Use is permitted under the terms of the MIT license.
+Please refer to LICENSE for further details.
+