**New Features**
- Added functions for creating legends and adding widgets to the map ([321](https://github.com/opengeos/leafmap/pull/321))
- New functions include `create_legend()`, `add_legend()`, `add_text()`, `add_image()`, `add_html()`, and `add_widget()`
- Added two notebook examples for using newly added functions
- Split-map now supports adding multiple legends
- Added ESA World Cover 2021 basemaps