Add new Issue & PR templates

docs/ISSUE_TEMPLATE/bug_report.md

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+---
+name: "Bug report"
+about: "Something went wrong, please fix it!"
+title: "[BUG] "
+labels: "is:bug", "status:pending-review"
+---
+
+**Describe the bug**
+Begin with a short description of what the bug is.
+
+If possible, include screen{shots,casts} and a link to your private config, if
+it is available publicly.
+
+<details>
+<pre>
+If you received an error, paste the backtrace here.
+
+To acquire a backtrace either:
+
+1. Turn on debug mode with `M-x toggle-debug-on-error` or
+2. Start Emacs with `emacs --debug-init`
+3. Or, if the error occurred while using `bin/doom`, use the `-d` or `--debug`
+   switch.
+
+Then recreate the error and Emacs should produce a backtrace.
+</pre>
+</details>
+
+**Steps to reproduce**
+1. Select these example steps,
+2. Delete them,
+3. And replace them with precise steps to reproduce your issue.
+4. Fill in "system information" below.
+
+**Expected behavior**
+Describe what you expected to happen.
+
+**System information**
+Paste the output of `M-x doom/info` or `~/.emacs.d/bin/doom info` here.

docs/ISSUE_TEMPLATE/feature_request.md

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+---
+name: "Feature Request"
+about: "Make suggestions for improving Doom Emacs"
+title: "[FEATURE] "
+labels: "is:request", "status:pending-review"
+---
+
+**Describe the feature**
+Start with a one-or-two sentence summary of your suggestion or request.
+
+Then follow with an expanded explanation. A few suggestions of what you could
+include here:
+
++ Why you think it would be helpful,
++ Screenshots/casts of this feature in another editor or elsewhere,
++ Links to any relevant packages.
+
+**Relevant resources**
+Include links to relevant plugins, projects and/or websites.
+
+**System information**
+Include the output of `M-x doom/info` or `~/.emacs.d/bin/doom info` here. It's
+possible that the feature you're requesting is already in Doom, but you haven't
+enabled it.

docs/ISSUE_TEMPLATE/howto.md

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+---
+name: "How do I..."
+about: "How to get Doom to behave a certain way"
+title: "[HOWTO] "
+labels: "is:howto", "status:pending-review"
+---
+
+**What I want to achieve**
+Start with a one-or-two sentence summary of what you are trying to do.
+
+Then follow with an expanded explanation. A few suggestions of what you could
+include:
+
++ Code or steps you've tried that did not yield the results you wanted,
++ Screenshots/casts of similar features in another editor or elsewhere,
++ Additional material or links to resources that could help clarify what you are
+  trying to do.
++ A link to your private config, if it is available publicly.
+
+**System information**
+If it is pertinent to your goal, include the output of `M-x doom/info` or
+`~/.emacs.d/bin/doom info` here.

docs/ISSUE_TEMPLATE/question.md

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+---
+name: "Question"
+about: "A question about the project or maintainer"
+title: "[QUESTION] "
+labels: "is:question", "status:pending-review"
+---
+
+Start with a one-or-two sentence summary of your question.
+
+Then follow with an expanded explanation...