Add issue template

.github/ISSUE_TEMPLATE.md

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+**The following are 'hard suggestions': if you have the information
+available to you, you really should put it in the report. Choose one of
+the following templates from below that best fits the issue you wish to
+report.**
+
+# Performance issue
+___This section should be used for any report regarding performance issues___
+
+###  Timings or Profile link:
+___We ask that all timings/profiles are a link, not a screenshot. Screenshots inhibit our ability to figure out the real
+cause of the issue.___
+
+### Description of issue:
+___If applicable___
+
+### Plugin list:
+
+### bukkit.yml, spigot.yml, paper.yml, server.properties
+___Gist/pastebin/hastebin links___
+### Other helpful links
+___The more information we receive, the quicker and more effective we can be at finding the solution to the
+issue.___
+
+### Paper build number:
+___This can be found by running `/version` on your server. `latest` is not a proper version number; we require the output of `/version` so we can properly track down the issue.___
+# Incompatibility (Bug)
+
+### What behaviour is expected:
+___What you expected to see___
+### What behaviour is observed:
+___What you actually saw___
+### Steps/models to reproduce:
+___This may include a build schematic, a video, or detailed instructions to help reconstruct the issue___
+
+### Plugin list:
+___A list of your plugins___
+
+### Paper build number:
+___This can be found by running `/version` on your server. `latest` is not a proper version number; we require the output of `/version` so we can properly track down the issue.___
+
+# Crash, Stacktrace
+
+### Link/paste of stack trace
+
+    You can also simply just use code formatting in markdown!
+___We need all of the stack trace! Do not cut off parts of it.___
+
+### Plugin list:
+___A list of your plugins___
+### Actions to reproduce (if known):
+___This may include a build schematic, a video, or detailed instructions to help reconstruct the issue___
+
+### Paper build number:
+___This can be found by running `/version` on your server. `latest` is not a proper version number; we require the output of `/version` so we can properly track down the issue.___
+
+# Suggestion
+
+___We love suggestions! Suggestions are fairly unstructured, and will be treated as such___