chore: add instructions for translation. (#372)

* Update README.md

* Update README.md

* Restyled by prettier (#373)

Co-authored-by: Restyled.io <[email protected]>

* Update README.md

Co-authored-by: restyled-io[bot] <32688539+restyled-io[bot]@users.noreply.github.com>
Co-authored-by: Restyled.io <[email protected]>

README.md

@@ -6,10 +6,12 @@
 
 <!-- prettier-ignore-start -->
 <!-- ALL-CONTRIBUTORS-BADGE:START - Do not remove or modify this section -->
-[![All Contributors](https://img.shields.io/badge/all_contributors-19-orange.svg?style=flat-square)](#contributors-)
+[![All Contributors](https://img.shields.io/badge/all_contributors-19-orange.svg?style=flat-square)](#contributors)
 <!-- ALL-CONTRIBUTORS-BADGE:END -->
+[![Crowdin](https://badges.crowdin.net/e/16ae8d16b81da30a3d782733464f3da2/localized.svg)](https://wevsvirushack.crowdin.com/covmap)
 <!-- prettier-ignore-end -->
 
+
 # CovMapper
 
 A webapp to display large-scale epidemiological data and forecasts of the SARS-CoV-2 pandemic.
@@ -42,6 +44,15 @@ node dev/generate-random-data-for-geojson --help
 
 We use a shared `master` branch, with short lived feature branches. Create a branch, add your changes locally, use `git add X && git commit`, then create a Pull Request.
 
+### How to help translate?
+
+If you want to translate the CovMap into a different language [you can help us without knowing anything about programming, just click here](https://wevsvirushack.crowdin.com/covmap).
+
+Please note that there is only one single source for the tranlsations - the german files in this repository, if you want to change them, edit the files below:
+
+- [Common Texts](https://github.com/CovOpen/CovMapper/blob/master/static/locales/de/common.json)
+- [Official App Texts](https://github.com/CovOpen/CovMapper/blob/master/apps/official/static/locales/de/translation.json)
+
 ## Contributors ✨
 
 Thanks goes to these wonderful people ([emoji key](https://allcontributors.org/docs/en/emoji-key)):