Include GitHub issue templates

.github/ISSUE_TEMPLATE.md

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+<!--
+Thanks for taking the time to draft up an issue for the Axon Server API!
+Prior to starting off, please read the following:
+
+## Usage Questions
+
+If you are having difficulty using the Axon Server API,
+ please consider checking Axoniq Docs first if it answers your question: https://https://docs.axoniq.io/home/
+
+When the documentation does not cover the specific question you have, take the following into account:
+- GitHub is *not* intended for usages questions, instead:
+- Drop a questions on Axoniq's forum: https://discuss.axoniq.io/
+- Or place a new question on StackOverflow, using the `axon` tag.
+
+## Reporting a bug, feature, enhancement, or documentation change
+
+Prior to filing an issue, please verify that it's not already reported by someone else.
+After that's done, your issue will typically fall under one of the following options:
+
+1. It's a `bug`
+2. It's a `feature` request
+3. It's an `enhancement` request
+4. It's a `documentation` change
+
+It is recommended that for either of the four you use one of the prepared issue template.
+You can find all three of them [here](https://github.com/AxonIQ/axon-server-api/issues/new/choose). 
+
+## None of the above fit!
+
+If you have encountered a use case which is not a question, nor a feature request, feel free to draft your scenario below.
+-->

.github/ISSUE_TEMPLATE/1_feature_request.md

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+---
+name: 'Feature request'
+about: 'Suggest a feature for the Axon Server API'
+title:
+type: 'Feature'
+---
+
+<!-- Please use markdown (https://guides.github.com/features/mastering-markdown/) semantics throughout the feature description. -->
+
+### Feature Description
+
+<!-- 
+    Please provide a description of the feature you envision.
+    For example (pseudo-)code snippets showing what it might look like help us understand your suggestion better. 
+-->
+
+### Current Behaviour
+
+<!-- Please share the current behaviour of the Axon Server API around this topic, if applicable. -->
+
+### Wanted Behaviour
+
+<!-- Please describe the desired outcome through the Axon Server API around the suggested feature. -->
+
+### Possible Workarounds
+
+<!-- If applicable, share any workarounds for the described feature. -->

.github/ISSUE_TEMPLATE/2_enhancement_request.md

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+---
+name: 'Enhancement request'
+about: 'Suggest an enhancement/change to an existing feature for the Axon Server API'
+title:
+type: 'Enhancement'
+---
+
+<!-- Please use markdown (https://guides.github.com/features/mastering-markdown/) semantics throughout the enhancement description. -->
+
+### Enhancement Description
+
+<!-- Please provide a description of the enhancement you envision. -->
+
+### Current Behaviour
+
+<!-- Please share the current behaviour of the Axon Server API around this topic, if applicable. -->
+
+### Wanted Behaviour
+
+<!-- Please describe the desired outcome through the Axon Server API around the suggested enhancement. -->
+
+### Possible Workarounds
+
+<!-- If applicable, share any workarounds for the described enhancement. -->

.github/ISSUE_TEMPLATE/3_bug_report.md

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+---
+name: 'Bug report'
+about: 'Report a bug in the Axon Server API'
+title:
+type: 'Bug'
+---
+
+<!-- Please use markdown (https://guides.github.com/features/mastering-markdown/) semantics throughout the bug description. -->
+
+### Basic information
+
+* Axon Server version:
+* Axon Server API version:
+* JDK version:
+* Environment details:
+* Complete executable reproducer if available (e.g. GitHub Repo):
+
+### Steps to reproduce
+
+<!-- 
+    Share all steps to be able to reproduce the bug, ideally based on a reproducer.
+    Combining this with a description of your setup helps us to figure out what the issue might be. 
+-->
+
+### Expected behaviour
+
+<!-- Please describe the expected behaviour. -->
+
+### Actual behaviour
+
+<!-- 
+    Please describe the actual behaviour as discovered.
+    If available, provide the entire stack trace, with markdown (```) semantics. 
+-->

.github/ISSUE_TEMPLATE/4_documentation_change.md

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+---
+name: 'Documentation change'
+about: 'Suggest a documentation change in the Axon Server API'
+title:
+type: 'Documentation'
+---
+
+<!-- Please use markdown (https://guides.github.com/features/mastering-markdown/) semantics throughout the enhancement description. -->
+
+### Suggested Documentation change
+
+<!-- Please provide a description of the documentation change you envision. -->