New Licensing (#128)

* Add README.md for data and licensing

* Move content to new README from data/README.md

* Add attribution suggestion

* Improve displaying of the attribution

README.md

@@ -10,8 +10,14 @@ This site show's general information about Radschnellverbindungen (cycle highway
 
 ## 💾 Data
 
+TLDR: The (geo)data is available in the [`radschnellwege/`](./src/radschnellwege) folder. If you use the data, attribute it like this:
+
+> © [FixMyCity](https://fixmycity.de)/[RSV-Dossier](https://github.com/FixMyBerlin/rsv-dossier) - [ODbL License](https://opendatacommons.org/licenses/odbl/summary/index.html)
+
 You find the geometry and meta information about the highways under [`./src/radschnellwege/`](./src/radschnellwege/). There is one file for all highways in [`meta/`](./src/radschnellwege/meta) folder containing the meta information. In the [`geometry/`](./src/radschnellwege/geometry) folder, every cycle highway has one individual file. In [`./data/schema/`](./data/schema/)you'll find the schema for the json files. It enables the validation of the files via gatsby.
 
+See [**README.md**](./src/radschnellwege/README.md) for more details.
+
 ## 🧑‍💻 Developing
 
 If you found any bugs feel free to create an issue.
@@ -43,9 +49,11 @@ For production you will also need a `.env.production` file. Otherwise the module
 
 ## License
 
-This project is licensed under the AGPL-3.0 License - see the [LICENSE.md](LICENSE.md) file for more information.
+This project has different licenses. The code is licensed under the AGPL-3.0 License - see the [LICENSE.md](LICENSE.md) file for more information.
 It contains dependencies which have different Licenses, see [`package.json`](./package.json).
 
+For the license of the data, please see the specific [README.md](./src/radschnellwege/README.md) respectively [LICENSE](./src/radschnellwege/LICENSE) file.
+
 ## Thanks
 
 - This page is based on `gatsby-starter-ts` by João Pedro Schmitz, https://github.com/jpedroschmitz/gatsby-starter-ts (License: MIT)