dinoClock: readme add

apps/dinoClock/README.md

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+# dinoClock
+
+Watchface with T-Rex Dinosaur from Chrome.
+It displays current temperature and weather.
+
+**Warning**: Element position and styles can change in the future.
+
+Based on the [Weather Clock](https://github.com/espruino/BangleApps/tree/master/apps/weatherClock).
+
+# Requirements
+
+**This clock requires Gadgetbridge and the weather app in order to get weather data!**
+
+See the [Bangle.js Gadgetbridge documentation](https://www.espruino.com/Gadgetbridge) for instructions on setting up Gadgetbridge and weather.
+
+![Screenshot](screens/screen1.png)
+