📝 Add docs for translation

src/FluentHub.App/Strings/README.md

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+# 😸 FluentHub Translations
+
+#### These are the translation/i18n resources for FluentHub
+
+---
+
+Before contributing to these string resources, *please please please* read this!
+
+Currently, Crowdin translation is implemented to manage the translation resources for FluentHub. Therefore, you are strongly encouraged, if not required, to translate exclusively on that platform.
+No matter how great, your translation PRs will be declined or rejected if you do not adhere to this.
+You can contribute easily at [crowdin.com/fluenthub](https://crowdin.com/project/fluenthub), which will ensure your translations are implemented.
+If a language is missing and you'd like to contribute a new one, feel free to ask in a new issue or via [the FluentHub Discord server](https://dsc.gg/fluenthub).