added readme

README.md

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+# nymea plug-ins modbus
+
+--------------------------------------------
+<p align="center">
+  <a  href="https://nymea.io">
+    <img src="https://nymea.io/downloads/img/nymea-logo.svg" width=300>
+  </a>
+</p>
+
+
+This repository contains modbus integrations for nymea. 
+
+nymea (/[n'aiːmea:]/ - is an open source IoT edge server. The plug-in based architecture allows to integrate protocols and APIs. With the build-in rule engine you are able to interconnect devices or services available in the system and create individual scenes and behaviours for your environment.
+
+
+## Getting help
+
+If you want to present your project or want to share your newest developments you can share it in
+[Our Forum](https://forum.nymea.io)
+
+If you are facing any troubles, don't hesitate to reach out for us or the community members, we will be pleased to help you:
+Chat with us on [Telegram](http://t.me/nymeacommunity)
+
+## Documentation
+
+* A detailed description how to install and getting started with the *nymea* can be found here:
+
+    [nymea | user documentation](https://nymea.io/documentation/users/installation/getting-started).
+
+* A detailed documentation for developers can be found here:
+
+    [nymea | developer documentation](https://nymea.io/documentation/developers/).
+
+
+## Contributing
+
+To contribute support for a device or service, you're welcome to file a pull request to this repository. If you need help in creating an integration plugin, feel free to ask in our forum or the Telegram group as well.
+
+If you don't have any developer skills at all, still feel free to bring the topic up. Our community is happy to help wherever possible."
+
+## License
+--------------------------------------------
+> nymea is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 3 of the License.