TELESTION-449 Add a README to the backend-deno library

backend-deno/LICENSE

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+MIT License
+
+Copyright (c) 2023 WüSpace e. V.
+
+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.

backend-deno/README.md

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+# Telestion Service Framework for Deno
+
+[![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.10407142.svg)](https://doi.org/10.5281/zenodo.10407142)
+![GitHub License](https://img.shields.io/github/license/wuespace/telestion)
+
+This library provides a framework for building Telestion services in Deno.
+
+## Usage
+
+```typescript
+import {startService} from 'https://deno.land/x/telestion/mod.ts';
+
+const {nc} = await startService();
+```
+
+`nc` is a `NatsConnection` instance. The library automatically handles the connection to the NATS broker.
+
+For more information, have a look at
+the [documentation](https://docs.telestion.wuespace.de/Backend%20Development/typescript/).
+
+## Behavior Specification
+
+The behavior of this library is specified in
+the [Behavior Specification](https://docs.telestion.wuespace.de/Backend%20Development/service-behavior/).
+This specification is also used to test the library.
+The source code of the tests can be found in the repository under `/backend-features`.
+
+## License
+
+This project is licensed under the terms of the [MIT license](LICENSE).