Add issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Please share one of:
+* A REPL using https://svelte.dev/repl/ (you can import from "@rgossiaux/svelte-headlessui" there and it will install from npm)
+* A git repository which reproduces the issue
+* A full code snippet which reproduces the issue
+
+**Library version**
+Add the version of `svelte-headlessui` that you are using here.

.github/ISSUE_TEMPLATE/other.md

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+---
+name: Other
+about: Other issues
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+