Update README and add LICENSE

LICENSE

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+MIT License
+
+Copyright (c) 2021 Michal Laskowski
+
+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.

README.md

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 # FTMSTrainer
 
-A description of this package.
+## About the project
+
+An implementation of an FTMS protocol client. Could be useful for apps that would like to communicate with FTMSTrainers.  
+Mine does and it works. Will post a link here once it is published.
+
+### Built with
+
+FTMSModels - no libraries, but honorable mentions to other sources on GitHub:
+
+* https://github.com/gamma/FTMS-Bluetooth/blob/master/Sources/FTMS%20Bluetooth/Utils/Fields.swift
+* https://github.com/oesmith/gatt-xml/blob/master/org.bluetooth.characteristic.indoor_bike_data.xml
+* https://github.com/gamma/FTMS-Bluetooth/blob/master/Sources/FTMS%20Bluetooth/FTMSUUIDs.swift
+
+FTMSTrainer - uses FTMSModels and:
+
+* [RxBluetoothKit](https://github.com/Polidea/RxBluetoothKit)
+* [RxSwift](https://github.com/ReactiveX/RxSwift)
+
+## Getting started
+
+To use the decoders in your project, add this Swift Package in your project. You can choose the model layer only `FTMSModels`, or classes to communicate with the trainer `FTMSTrainer`.
+
+## Usage
+
+Simple example for demonstration:
+
+```
+import FTMSModels
+import FTMSTrainer
+
+let scanner = TrainerScanner()
+let trainer = scanner.scan()
+    .filter { $0.count > 0 }
+    .take(1)
+    .flatMap { trainers -> FTMSConnectedTrainer in
+        trainers[0].connect()
+    }
+
+let disposeBag = DisposeBag()
+
+trainer.controlPointError
+    .subscribe(onNext: { error in
+        print("Control point error: %@", error)
+    }).disposed(by: disposeBag)
+
+let command = TrainingCommand.resume // check Commands.swift for a list of commands
+trainer.send(command: command)
+   .subscribe()
+   .disposed(by: disposeBag)
+```
+
+## Roadmap
+
+1. Need to add tests. The project was written quickly, trying with a real trainer what works and what doesn't when communicating with turbo trainer.
+2. Improving together with my own app, as needed.
+3. Awaiting potential requests/bug fixes.
+
+## Contributing
+
+1. Fork the Project
+2. Create your Feature Branch (`git checkout -b feature/AmazingFeature`)
+3. Commit your Changes (`git commit -m 'Add some AmazingFeature'`)
+4. Push to the Branch (`git push origin feature/AmazingFeature`)
+5. Open a Pull Request
+
+
+## License
+
+Distributed under the MIT License. See `LICENSE` for more information.