Added README

README.md

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+# Nightscout Rainmeter Skin
+
+This is a Rainmeter skin that is used to retrieve and visualize glucose monitoring data from Nightscout REST API.
+
+![alt text](https://github.com/vesegluco/nightscout-rainmenter-skin/blob/master/Nightscout-Rainmeter.PNG?raw=true)
+
+## Installation
+
+Download newest release and use Rainmeter installer to install the skin. After the installation you need to modify the .ini file variables:
+
+```bash
+TOKEN =  <your-nightscout-user-token>
+DOMAIN = <your-nighscout-server-address> e.g. my-nightscout.asdfg.com
+```
+
+Token can be generated by creating a Nightscout user. Only the "Readable" role is required for this skin to work.
+
+## Contributing
+
+Pull requests are welcome. For major changes, please open an issue first
+to discuss what you would like to change.
+
+Please make sure to update tests as appropriate.