Add issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Something is wrong
+title: ''
+labels: bug, need-info
+assignees: ''
+
+---
+
+Please delete this template text before filing, but you _need_ to include the following:
+
+- Watchexec's version
+- The OS you're using
+- A log with `-vvv` (if it has sensitive info you can email it at felix@passcod.name — do that _after_ filing so you can reference the issue ID)
+- A sample command that you've run that has the issue
+
+Thank you

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Something is missing
+title: ''
+labels: feature
+assignees: ''
+
+---
+
+<!-- Please note that this project has a high threshold for changing default behaviour or breaking compatibility. If your feature or change can be done without breaking, present it that way. -->
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+If proposing a new CLI option, option names you think would fit.
+
+**Additional context**
+Add any other context about the feature request here.

.github/ISSUE_TEMPLATE/regression.md

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+---
+name: Regression
+about: Something changed unexpectedly
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**What used to happen**
+
+**What happens now**
+
+**Details**
+- Latest version that worked:
+- Earliest version that doesn't: (don't sweat testing earlier versions if you don't remember or have time, your current version will do)
+- OS:
+- A debug log with `-vvv`:
+
+```
+```
+
+<!-- You may truncate the log to just the part supporting your report if you're confident the rest is irrelevant. If it contains sensitive information (if you can't reduce/reproduce outside of work you'd rather remain private, you can either redact it or send it by email.) -->