Update README.md (#42)

README.md

@@ -1,8 +1,29 @@
-# TODO
-Fill out Dockerfile
+# E-Edu Gateway Microservice
 
-Fill out docker-compose.yml
+This projects contains the source code for the gateway microservice which
+is responsible for collecting and filtering information requested by the frontend using GraphQL.
 
-Fill out GitHub Action workflow
+## How to build
+Run:
+```sudo docker build --tag eedu/gateway:latest .```
 
-Fill out README
+## How to start the docker stack
+Run:
+```sudo docker-compose up```
+
+or in detached mode:
+```sudo docker-compose up -d```
+
+## Contribute
+
+You want to contribute to this project? Great!
+
+[Drafts & Documentation](https://github.com/E-Edu/draft-documents)<br>
+[Git Workflow (German)](https://github.com/E-Edu/general/blob/master/guides/conventions.md)<br>
+[Code Style (German)](https://github.com/E-Edu/general/blob/master/guides/conventions.md#code-style)
+
+
+## License
+
+This project is licensed under the `GNU General Public License v3.0`<br>
+See `LICENSE` for more information