Added readme

README

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+# MAX7456JSON
+
+MAX7456JSON is an Arduino project for generating TUI interfaces on weird old school devices.
+
+## Build
+
+Use PlatFormIO [PlatformIO](https://platformio.org/) to build the project.
+
+```bash
+pip install platformio
+git clone https://code.jcktrue.dk/jct/MAX7456JSON
+pio run -t upload
+```
+
+## Usage
+
+Send JSON commands over the serial port
+
+```json
+{"command":"write","x":1,"y":2,"text":"testing"}
+```
+
+# Documentation
+
+Low level API documentation is auto generated and pushed to 
+[API docs](https://share.jcktrue.dk/MAX7456JSON/dev/docs/)
+
+# Download
+Ready made firmware images can be downloaded as HEX files.
+
+- [Unstable](https://share.jcktrue.dk/MAX7456JSON/dev/)
+- [Releases](https://share.jcktrue.dk/MAX7456JSON/)
+
+
+## Contributing
+Pull requests are welcome. For major changes, please open an issue first to discuss what you would like to change.
+
+
+## License
+[MIT](https://choosealicense.com/licenses/mit/)