chore: add README and LICENSE

LICENSE

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+MIT License
+
+Copyright (c) 2023 Learnweb contributors
+
+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.

README.md

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+<p style="text-align: center"><img src="./.github/logo.webp" height="180" alt="Interweb Logo"/></p>
+
+# Learnweb - Collaborative learning environment with extended search and sharing functions
+
+<p style="text-align: center">
+<a href="https://opensource.org/licenses/MIT" alt="License: MIT">
+   <img src="https://img.shields.io/badge/License-MIT-yellow.svg"/></a>
+<a href="https://github.com/l3s-learnweb/learnweb/tags" alt="Releases">
+   <img src="https://img.shields.io/github/v/tag/l3s-learnweb/learnweb"/></a>
+</p>
+
+Learnweb is a collaborative search and sharing system which brings together different online services such as
+YouTube, Flickr, Bing, Vimeo and SlideShare under one umbrella. It also provides advanced features for organizing and
+sharing distributed resources with a group of people.
+
+## History
+
+The history of this project starts in 2009 with the work of Dr. Sergej Zerr and his students at the L3S Research Center.
+Since that time, the system was continuously developed and improved by many students and researchers, to meet the needs
+of all user groups – teachers, learners, researchers.
+
+LearnWeb has been adapted to learning scenarios such as the YELL/TELL community and research projects such as EU-MADE4LL.
+YELL/TELL stands for Young English Language Learners/Teen English Language Learners and is a virtual meeting place for
+foreign language teachers, language students and university lecturers who can seek, share, evaluate and adapt resources
+to professional practice. The EU-MADE4LL project (European Multimodal and Digital Education for Language Learning)
+promotes the modernisation of higher education and the employability of graduates.
+
+## License
+
+This project is licensed under the MIT License - see the [LICENSE](LICENSE) file for details.