Added README

Author: bhermann

README.md

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+# Delphi Web API
+
+The web API implementation for the Delphi platform.
+
+We are currently in pre-alpha state! There is no release and the code in
+this repository is purely experimental!
+
+|branch | status | codacy |
+| :---: | :---: | :---: |
+| master | [![Build Status](https://travis-ci.org/delphi-hub/delphi-webapi.svg?branch=master)](https://travis-ci.org/delphi-hub/delphi-webapi) | [![Codacy Badge](https://api.codacy.com/project/badge/Grade/8ebe27850ffb4139af6280fd1cd6d540)](https://www.codacy.com/app/delphi-hub/delphi-webapi?utm_source=github.com&utm_medium=referral&utm_content=delphi-hub/delphi-webapi&utm_campaign=Badge_Grade)|
+| develop | [![Build Status](https://travis-ci.org/delphi-hub/delphi-webapi.svg?branch=develop)](https://travis-ci.org/delphi-hub/delphi-webapi) | [![Codacy Badge](https://api.codacy.com/project/badge/Grade/8ebe27850ffb4139af6280fd1cd6d540?branch=develop)](https://www.codacy.com/app/delphi-hub/delphi-webapi?branch=develop&utm_source=github.com&utm_medium=referral&utm_content=delphi-hub/delphi-webapi&utm_campaign=Badge_Grade) |
+
+## What is the Delphi Web API?
+
+It is the primary access point to the Delphi system.
+
+## How does it work?
+
+The Delphi Web API communicates with the underlying Elasticsearch database to provide access to data.
+
+## How can I use it?
+
+If you just wish to query the results, maybe the public instance at https://delphi.cs.uni-paderborn.de is the right choice for you.
+
+If you want to run your own infrastructure, you can start the web API
+```
+sbt run
+```
+
+It expects a running instance of elasticsearch on port 9200 on the same machine.
+
+## Community
+
+Feel welcome to join our chatroom on Gitter: [![Join the chat at https://gitter.im/delphi-hub/delphi](https://badges.gitter.im/delphi-hub/delphi.svg)](https://gitter.im/delphi-hub/delphi?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
+
+
+## Contributing
+
+Contributions are *very* welcome!
+
+Before contributing, please read our [Code of Conduct](CODE_OF_CONDUCT.md).
+
+Refer to the [Contribution Guide](CONTRIBUTING.md) for details about the workflow.
+We use Pull Requests to collect contributions. Especially look out for "help wanted" issues
+[![GitHub issues by-label](https://img.shields.io/github/issues/delphi-hub/delphi-webapi/help%20wanted.svg)](https://github.com/delphi-hub/delphi-webapi/issues?q=is%3Aopen+is%3Aissue+label%3A%22help+wanted%22),
+but feel free to work on other issues as well.
+You can ask for clarification in the issues directly, or use our Gitter
+chat for a more interactive experience.
+
+[![GitHub issues](https://img.shields.io/github/issues/delphi-hub/delphi-webapi.svg)](https://github.com/delphi-hub/delphi-webapi/issues)
+
+
+## License
+
+The Delphi Web API is open source and available under Apache 2 License.
+
+[![GitHub license](https://img.shields.io/github/license/delphi-hub/delphi-webapi.svg)](https://github.com/delphi-hub/delphi-webapi/blob/master/LICENSE)