Add issue, pull request templates

.github/ISSUE_TEMPLATE.md

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+<!--
+    Thanks for filing a new issue on MobArena! To help us help you, please use
+    this template for filing your bug, feature request, or other topic.
+
+    If you use this template, it helps the developers review your ticket and
+    figure out the problem. If you don't use this template, we may close your
+    issue as not enough information.
+ -->
+
+# Summary
+
+<!--
+    Choose the type of issue you are filing. You can choose one by typing [X] in
+    one of the fields. For example, if a bug report, change the line below to…
+
+    [X] Bug report
+ -->
+
+* This issue is a…
+    * [ ] Bug report
+    * [ ] Feature request
+    * [ ] Other issue
+    * [ ] Question <!-- Please read the wiki first! -->
+* **Describe the issue / feature in 1-2 sentences**: 
+
+
+# Background
+
+<!--
+    This section is very important! First, if you are filing a bug report,
+    DELETE the "Feature request" section. If it's a feature request, DELETE the
+    "Bug report".
+
+    If a bug report, make sure to include all info. This helps us see what
+    you're running and makes it easier to duplicate your problem.
+
+    If a feature request, help us understand your idea. Be descriptive, but also
+    consider any other issues that could happen if it is added. Would it affect
+    other features of MobArena?
+
+    You can get some of this info by typing these commands in-game:
+        /version MobArena: Get your MobArena plugin version
+        /version: Get your Bukkit/Spigot server version
+        /plugins: Get the plugins running on your server
+ -->
+
+### Bug report
+
+* **MobArena version**: 
+* **Server version**: 
+* **Plugins**:
+
+### Feature request 
+
+* **Feature type**:
+    * [ ] Arena configuration
+    * [ ] Classes
+    * [ ] Economy integration
+    * [ ] Leaderboards
+    * [ ] New config settings
+    * [ ] Other (please explain)
+    * [ ] Rewards
+    * [ ] Third-party plugin support
+
+**What does it do?**:
+
+**Does it need new or changed commands? What are they?**:
+
+**Does this feature affect other parts of MobArena?**:
+
+
+# Details
+
+<!--
+    If you have any other details to include, like screenshots, stacktraces¹, or
+    something more detailed, please include it here!
+
+    ¹ Stacktraces are the error messages you see in the console of your server.
+    If you have a long stacktrace, DO NOT PASTE IT HERE! Please use Pastebin and
+    add a link here.
+ -->
+
+* **Stacktrace** (if applicable): 
+
+<!--
+    Phew, all done! Thank you so much for filing a new issue! We'll try to get
+    back to you soon.
+ -->
+

.github/PULL_REQUEST_TEMPLATE.md

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+<!--
+    Hello! Thanks for submitting a pull request to MobArena. We appreciate your
+    time and interest in helping our project!
+
+    Use this template to help us review your change. Not everything is required,
+    depending on your change. Keep or delete what is relevant for your change.
+    Remember that it helps us review if you give more helpful info for us to
+    understand your change.
+ -->
+
+# Summary
+
+<!--
+    Update the checkbox for the type of contribution you are making. To choose
+    an option, add an X to the box. For example, if it's a bug fix, do this:
+
+    * [X] Bug fix
+ -->
+
+* This is a…
+    * [ ] Bug fix
+    * [ ] Feature addition
+    * [ ] Refactoring
+    * [ ] Minor / simple change (like a typo)
+    * [ ] Other
+* **Describe this change in 1-2 sentences**:
+
+
+# Problem
+
+<!-- 
+    Anything that helps us understand why you are making this change goes here.
+    What problem are you trying to fix? What does this change address?
+ -->
+
+* GitHub issue (_optional_):
+
+
+# Solution
+
+<!--
+    The details of your change. Talk about technical details, considerations, or
+    other interesting points. If you have a lot to say, be more detailed in this
+    section.
+ -->
+
+
+# Action
+
+<!--
+    Other than merging your change, do you want / need us to do anything else
+    with your change? This could include reviewing a specific part of your PR.
+ -->
+