Add rebbleagenda, pebble-like animated agenda.

apps/rebbleagenda/ChangeLog

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+0.01: Initial version

apps/rebbleagenda/README.md

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+# Rebble Agenda
+
+Agenda app for showing upcoming events in an animated fashion.
+Heavily inspired by the inbuilt agenda of the pebble time.  
+Switch between calendar events by swiping up or down. Click the button to exit.
+
+![Two events shown using the default light system theme](./screenshot_rebbleagenda_events.png)  ![The last event of the agenda shown using a custom red theme](./screenshot_rebbleagenda_customtheme.png)  ![An animated sun shows the day of the following events](./screenshot_rebbleagenda_sun.png)
+
+## Settings
+
+- *Use system theme* - Use the colors of the system theme. Otherwise use following colors.
+- *Accent* - The color of the rightmost accent bar if not following system theme.
+- *Background* - The background color to use if not following system theme.
+- *Foreground* - The foreground color to use if not following system theme.
+
+## Notes
+
+- The weather icon in the top right corner is currently just showing the current weather as provided by [weather](https://github.com/espruino/BangleApps/blob/master/apps/weather/). Closest forecast to be implemented in a future release.
+- Events only show as much of their title and description as can be fit on the screen, which is one and four (wrapped) lines respectively.
+- Events are loaded from ```android.calendar.json```, which is read in its entirety. If you have a very busy schedule, loading may take a second or two.
+
+## Creator
+
+- [Sarah Alrøe](https://github.com/SarahAlroe), August+September 2023