Updated Home (markdown)

Home.md

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 For a long time, our documentation consisted of our [API documentation](http://python-telegram-bot.readthedocs.io/) and README. As a result, the README became simply too big to be useful. In an effort to change that, we moved large parts of our README into different Wiki articles. In the process, we improved the texts with additional information, clearer wording and some cross-references. 
 
 ### How to read this Wiki
-Ideally, this Wiki should read a bit like a [Choose Your Own Adventure](https://en.wikipedia.org/wiki/Choose_Your_Own_Adventure) book - You start with [page one](https://github.com/python-telegram-bot/python-telegram-bot/wiki/Introduction-to-the-API) and choose your way through the docs, depending on your preferences. At the end of most articles, you will find a section called **What to read next?**, where related articles are linked.
+Ideally, this Wiki should read a bit like a [Choose Your Own Adventure](https://en.wikipedia.org/wiki/Choose_Your_Own_Adventure) book - You start with [page one](https://github.com/python-telegram-bot/python-telegram-bot/wiki/Introduction-to-the-API) and choose your way through the docs, depending on your preferences. At the end of most articles, you will find a section called **What to read next?**, where related articles are linked.
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+### Contributing to this Wiki
+If you stumble upon a part of the wiki that is unclear or missing important points, please go ahead and drop us a message in our [Telegram Group](https://t.me/pythontelegrambotgroup). We'd like our wiki to be as complete as possible 🙂