Add LeaFlet Control-Credits plugin

[carlosign]

Hello, i ported the leaflet control credits plugin to folium, i dont know if its worth adding it to folium but it may be helpful for someone.

The plugin adds an image (credits) that works like a button and displays some text, it works with fullscreen plugin, i think its an alternative to ImagePlugin. https://github.com/GreenInfo-Network/Leaflet-Control-Credits Original plugin

Ported plugin to folium: https://github.com/carlosign/Folium.ControlCredits-Plugin

Thanks to all.

[Conengmo]

Hi @carlosign, thanks for sharing! We'll add it to our list of Folium add-ons. I'll leave this ticket open to remind me to do that.

[Conengmo]

Just added it to the readme. Again, thanks for sharing!