[ci-skip] Add better issue templates (#360)

Co-authored-by: Ben Kerllenevich <me@notom3ga.me>

.github/ISSUE_TEMPLATE/performance_problem.md

@@ -0,0 +1,44 @@
+---
+name: Performance Problem
+about: Report performance related problems or other areas of concern
+---
+
+<!--
+  Before reporting performance problems here, please make sure you are on the latest version of Purpur.
+-->
+
+## Timings link
+<!--
+  We ask that all timings are a link, not a screenshot. Screenshots inhibit our ability to figure out the real cause of the issue.
+  Example: https://timings.pl3x.net/?id=4cd655d32ad445aa9063f2130ae3b794
+-->
+
+## Description of issue
+<!--
+  Please describe your issue in detail.
+-->
+
+## Purpur version
+<!--
+  Run `/version` on your server and **paste** the full, unmodified output here.
+  "latest" is *not* a version; we require the output of `/version` so we can adequately track down the issue.
+  Additionally, do NOT provide a screenshot, you MUST paste the entire output.
+
+  > version
+  [18:58:15 INFO]: Checking version, please wait...
+  [18:58:15 INFO]: This server is running Purpur version git-Purpur-1126 (MC: 1.16.5) (Implementing API version 1.16.5-R0.1-SNAPSHOT)
+  [18:58:15 INFO]: You are running the latest version
+  [18:58:15 INFO]: Previous version: git-Purpur-1120 (MC: 1.16.5)
+-->
+
+## Agreements
+Please agree to the following.
+- [ ] I am running the latest version of Purpur available from https://purpur.pl3x.net/downloads.
+- [ ] I have searched for and ensured there isn't already an open issue regarding this.
+- [ ] My version of Minecraft is supported by Purpur.
+
+## Other
+<!--
+  Please include other helpful information below. A Spark report can come in handy.
+  The more information we receive, the quicker and more effective we can be at finding the solution to the issue.
+-->