add ISSUE_TEMPLATE.md and CONTRIBUTING.md

.github/CONTRIBUTING.md

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+# Thank you for contributing to Delta Chat.
+
+If you like to discuss a **new feature** or submit suggestions,
+please use the community forum:
+
+* <https://support.delta.chat>
+
+If you intend to send a **bug report** for Delta Chat, 
+search for existing bugs first:
+
+* [Core](https://github.com/deltachat/deltachat-core/issues?&q=is%3Aissue)
+* [Android](https://github.com/deltachat/deltachat-android/issues?&q=is%3Aissue)
+* [iOS](https://github.com/deltachat/deltachat-ios/issues?&q=is%3Aissue)
+* [Desktop](https://github.com/deltachat/deltachat-ios/issues?&q=is%3Aissue)
+* [Node](https://github.com/deltachat/deltachat-node/issues?&q=is%3Aissue)
+
+In short, the Android/iOS/Desktop parts are about the User Interface.
+The Core part is about handling the connection to the mail server and the chat 
+or e-mail messages as well as providing secure communication by using 
+[Autocrypt](https://autocrypt.org/en/latest/).
+
+A _bug_ is a reproducable misbehaviour, 
+when something happens but something else should happen instead. 
+
+Please try to create your issue in the respective issue tracker.
+
+Did you know there is a [Help](https://delta.chat/en/help) page for Delta Chat?
+
+To ask questions, you are also invited to join our IRC channel #deltachat
+on [Freenode](https://kiwiirc.com/nextclient/#irc://irc.freenode.net/deltachat).
+

.github/ISSUE_TEMPLATE.md

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+<!--
+This is a bug report tracker. New features are discussed in the forum: https://support.delta.chat
+
+Please fill out as much of this form as you can (leaving out stuff that is not applicable is ok).
+-->
+
+- Device:
+- iOS version:
+- Delta Chat version:
+- Expected behavior:
+- Actual behavior:
+- Steps to reproduce the problem:
+- Screenshots:
+- Logs:
+
+<!--
+Debug logs can be accessed from within the Delta Chat app 
+with a shake-gesture.
+Alternatively, use Xcode
+
+Logs may contain private data 
+which shall be removed or anonymised prior to posting.
+-->
+