Add Performance Issue Template

.github/ISSUE_TEMPLATE/ISSUE_TEMPLATE.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+Thanks for opening an issue! For a project that deals with as many different things as P9k, debugging problems can be difficult. Please follow the guide, below, to create a bug report that will help us help you!
+
+### Before Opening a Bug
+P9k is lovingly maintained by volunteers, and we are happy to help you! You can help us by first making sure your issue hasn't already been solved before opening a new one. Please check the [Troubleshooting Guide](https://github.com/bhilburn/powerlevel9k/wiki/Troubleshooting) first. Many issues are actually local configuration problems, which may have previously been solved by another user - be sure to also [search the existing issues](https://github.com/bhilburn/powerlevel9k/issues?utf8=%E2%9C%93&q=is%3Aissue) before opening a new one.
+
+Once you've done these things, you can delete this section and proceed `=)`
+
+-----
+
+#### Describe Your Issue
+What is happening?
+
+Most issues are best explained with a screenshot. Please share one if you can!
+
+#### Have you tried to debug or fix it?
+
+Have you tinkered with your settings, and what happened when you did? Did you find a bit of code that you think might be the culprit? Let us know what you've done so far!
+
+#### Environment Information
+
+This information will help us understand your configuration.
+
+  - What version of ZSH are you using? You can use `zsh --version` to see this.
+  - Do you use a ZSH framework (e.g., Oh-My-ZSH, Antigen)?
+  - How did you install P9k (cloning the repo, by tarball, a package from your OS, etc.,)?
+  - What version of P9k are you using?
+  - Which terminal emulator do you use?
+
+#### Issues with Fonts & Icons
+You may delete this section if your issue is not font / icon related.
+
+  - Which font do you use?
+  - Which [font configuration mode](https://github.com/bhilburn/powerlevel9k/wiki/About-Fonts) are you using? You can check this with (`echo $POWERLEVEL9K_MODE`).
+  - Please share the contents of `$P9k/debug/font-issues.zsh`.
+  - If this is an icon problem, does the output of `$ get_icon_names` look correct?

.github/ISSUE_TEMPLATE/PERFORMANCE_ISSUE_TEMPLATE.md

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+---
+name: Performance Issue
+about: For performance Issues
+title: "[Performance]"
+labels: performance
+assignees: ''
+
+---
+
+Sorry to hear that the performance of P9K is not adequate. To fix this, please provide us with some hints.
+
+### Your Hardware
+
+Disk I/O is critical for P9K, so do you use a spinning disk, or a SSD?
+
+### Virtualization
+
+Do you use P9K in some sort of virtualization? This is also the case, if you use WSL on Windows..
+
+### How Fast is Fast
+
+Could you quantify how fast the specific segment is, that you think is slow?
+For example, if you think the `vcs` segment is slow, could you execute this command in the directory, where the segment is slow:
+
+```zsh
+time (repeat 10; do; prompt_vcs left 1 false >/dev/null; done;)
+```
+
+Also, please provide us with some context around the segment. In the `vcs` example:
+
+- How big is the repo?
+- Does it contain a lot of untracked files?
+- Does it contain a lot of git submodules?
+- Does it contain a lot of files in general?
+
+Additionally, you could install [zsh-prompt-benchmark](https://github.com/romkatv/zsh-prompt-benchmark), to benchmark the general performance of ZSH and P9K.
+
+If you don't know which segment is slow, could you remove one by one, and spot the one that made the greatest impact?