Add README.md and preview images

Author: davidecaruso

README.md

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+# Panerai Lo Scenziato
+Amazfit Stratos watchface.
+
+## Previews:
+![Unlocked](previews/unlocked.png)
+![Locked](previews/locked.png)
+
+## How to use
+- Download this repo;
+- Open a terminal:
+```bash
+cd /path/to/watchface;
+zip whatever-you-want.wfz ./*
+```
+- Copy the *.wfz file to your Amazfit Stratos.
+- Set the watchface through the menu. 
+
+## Author
+[Davide Caruso](https://davidecaruso.github.io)
+
+## License
+Licensed under [MIT](LICENSE).