Add issue templates

Author: wheeheee

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+## Describe the bug
+A clear and concise description of what the bug is.
+
+## To Reproduce
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+## Expected behavior
+A clear and concise description of what you expected to happen.
+
+## Minimal reproducer
+If possible, please share the code for a MWE here so we can reproduce the bug.
+````
+```julia
+function foo end
+[...]
+```
+````
+
+## Platform information
+Copy and paste the output of `versioninfo()` into a code block like this
+````julia-repl
+```julia-repl
+julia> versioninfo()
+Julia Version 1.12.4
+Commit 01a2eadb04 (2026-01-06 16:56 UTC)
+[...]
+```
+````
+
+## Additional context
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+**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.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.

.github/ISSUE_TEMPLATE/inadequate-documentation.md

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+---
+name: Inadequate documentation
+about: Report missing or inadequate documentation
+title: "[DOCS]"
+labels: documentation
+assignees: ''
+
+---
+
+**Which functions have missing / insufficient documentation? List all these functions, with type signatures if desired.**
+- `foo`
+- `bar`
+- `baz(::Vector{Int}, ::Vector{Float64})`
+
+**Describe what additional documentation you'd like (NA if it's just missing)**
+A clear and concise description of the kind of documentation you would like to see.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.