chore: add github issue and pr templates

.github/ISSUE_TEMPLATE/bug.md

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+---
+name: 🐞 Bug report
+description: Report a bug
+labels: ["bug"]
+---
+
+Describe the bug you've encountered.
+
+## Environment
+
+- OS:
+- Terminal:
+- Neovim version:
+- Smear-cursor version/commit:

.github/ISSUE_TEMPLATE/config.yaml

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+blank_issues_enabled: false

.github/ISSUE_TEMPLATE/feature.md

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+---
+name: ✨ Feature request
+description: Suggest a new feature or enhancement
+labels: ["enhancement"]
+---
+
+Describe the feature you'd like to see implemented.
+Suggest a solution if you have one in mind.
+Give alternatives you've considered.

.github/ISSUE_TEMPLATE/performance.md

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+---
+name: 🐌 Performance issue
+description: Report a performance issue
+labels: ["performance"]
+---
+
+Describe the performance issue you're experiencing.
+
+## Environment
+
+- OS:
+- Terminal:
+- Neovim version:
+- Smear-cursor version/commit:

.github/PULL_REQUEST_TEMPLATE.md

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+Explain the purpose and scope of your contribution.
+
+## Changes
+
+- add ...
+- remove ...
+- change ...
+- fix ...
+
+
+## Related GitHub issues and pull requests
+
+- fix #...