Share button to allow spreading of the app easily

[hermlon]

Offer a share button which shares the link to the app and a simple message to other apps like messengers, etc.
Idea for catchphrase to explain users why they should share this app with as many friends as possible:

Diese App ist am wirksamsten, je mehr Menschen in deiner Umgebung sie verwenden. Viren verbreiten sich exponentiell. Damit diese App sich schneller verteilt als das Virus, teile sie mit 3 Freunden!

This app is most effective when used by as many people in your surroundings as possible. Viruses spread exponentially. To make this app spread faster than the virus, share it with 3 of your friends.