Add GitHub issue templates

Author: mhluongo

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug Report
+about: Report a bug or unexpected behavior
+title: '[BUG] '
+labels: bug
+assignees: ''
+---
+
+## Bug Description
+
+A clear and concise description of what the bug is.
+
+## Steps to Reproduce
+
+1. Open Vim with '...'
+2. Edit Solidity file containing '...'
+3. Perform action '...'
+4. See error/unexpected behavior
+
+## Expected Behavior
+
+A clear description of what you expected to happen.
+
+## Actual Behavior
+
+What actually happened instead.
+
+## Minimal Solidity Code Example
+
+```solidity
+// Minimal code that reproduces the issue
+contract Example {
+    // ...
+}
+```
+
+## Environment
+
+- **Vim version**: (output of `vim --version`)
+- **OS**: (e.g., Ubuntu 22.04, macOS 14.0, Windows 11)
+- **Terminal**: (e.g., iTerm2, Windows Terminal, GNOME Terminal)
+- **vim-solidity version/commit**: (e.g., v0.8.0 or commit hash)
+- **Solidity version**: (if relevant, e.g., 0.8.24)
+
+## Additional Context
+
+Add any other context about the problem here, such as:
+- Does it happen with a minimal vimrc?
+- Related Vim plugins that might interact?
+- Screenshots if applicable
+
+## Checklist
+
+- [ ] I have searched existing issues for duplicates
+- [ ] I have tested with a minimal vimrc (`vim -Nu test/vimrc`)
+- [ ] I have provided a minimal code example
+- [ ] I have included my environment details

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature Request
+about: Suggest a new feature or enhancement
+title: '[FEATURE] '
+labels: enhancement
+assignees: ''
+---
+
+## Feature Description
+
+A clear and concise description of the feature you'd like to see.
+
+## Motivation / Use Case
+
+Why is this feature useful? What problem does it solve?
+
+## Proposed Solution
+
+How would you like this feature to work? Be as specific as possible.
+
+```vim
+" Example configuration or usage
+```
+
+```solidity
+// Example Solidity code if applicable
+```
+
+## Alternatives Considered
+
+What other approaches or workarounds have you considered?
+
+## Compatibility
+
+- Is this feature specific to a Solidity version? (e.g., 0.8.x only)
+- Should it work in both Vim and Neovim?
+- Does it depend on external tools? (e.g., solc, forge)
+
+## Scope
+
+- [ ] Syntax highlighting
+- [ ] Indentation
+- [ ] Code folding
+- [ ] File type detection
+- [ ] Toolchain integration (compiler, formatter)
+- [ ] Documentation
+- [ ] Other (please specify)
+
+## Additional Context
+
+Add any other context, mockups, screenshots, or examples about the feature request here.
+
+## Checklist
+
+- [ ] I have searched existing issues for similar requests
+- [ ] I have checked the [roadmap/plan](link-to-plan-if-available)
+- [ ] This feature aligns with pure Vim compatibility (no Neovim-only features)

.github/ISSUE_TEMPLATE/question.md

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+---
+name: Question
+about: Ask a question about using vim-solidity
+title: '[QUESTION] '
+labels: question
+assignees: ''
+---
+
+## Question
+
+What would you like to know about vim-solidity?
+
+## Context
+
+Provide context about what you're trying to accomplish:
+
+- What are you trying to do?
+- What have you already tried?
+- What's not working as expected?
+
+## Configuration
+
+If relevant, share your Vim configuration:
+
+```vim
+" Relevant parts of your .vimrc
+```
+
+## Environment
+
+- **Vim version**: (output of `vim --version`)
+- **vim-solidity version**: (e.g., v0.8.0 or commit hash)
+
+## Additional Information
+
+Any other details that might be helpful.
+
+---
+
+**Note**: For general Vim or Solidity questions unrelated to this plugin, you may find better help at:
+- [Vi and Vim Stack Exchange](https://vi.stackexchange.com/)
+- [Ethereum Stack Exchange](https://ethereum.stackexchange.com/)
+- [Solidity Documentation](https://docs.soliditylang.org/)