Add issue template (#260)

.github/issue_template.md

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+<!-- TIP: Hit 'Preview' for a more readable version of this template --> 
+
+### General information
+
+- Pure version: 1.x.x
+- ZSH version: 5.x.x
+- Terminal program & version: <!-- e.g. Hyper 1.0.0, iTerm 3.0.0, Terminal 2.7.1, xterm 327, other? -->
+- Operating system: <!-- e.g. macOS Sierra 10.12.1 -->
+- ZSH framework: <!-- e.g. oh-my-zsh, prezto, antigen, antibody, zplug, other? -->
+
+I have:
+- [ ] Tested with another terminal program and can reproduce the issue: <!-- e.g. iTerm, etc. -->
+- [ ] Followed the [Integration](https://github.com/sindresorhus/pure#integration) instructions for my framework
+
+### Problem description
+
+
+### Reproduction steps
+
+1.
+2.
+3.
+
+### My `.zshrc`:
+
+<!--
+Please provide a minimal `.zshrc` that reproduces the issue.
+Try to remove everything that that does not affect the issue, the fewer lines, the better.
+-->
+
+```shell
+autoload -U promptinit; promptinit
+prompt pure
+```