🛠️ chore(templates): Create issue and pull request templates

Author: NestorDP

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+labels: bug
+assignees: ''
+---
+
+## Describe the bug
+A clear and concise description of what the bug is.
+
+## To Reproduce
+Steps to reproduce the behavior:
+1. CMake configure flags:
+2. Build type (Debug/Release):
+3. Commands run:
+4. Minimal code snippet (if applicable):
+
+## Expected behavior
+What you expected to happen.
+
+## Actual behavior / logs
+Paste error messages, stack traces, or relevant logs.
+
+## Environment
+- OS: Linux (distro + version):
+- Kernel version: `uname -r`:
+- Compiler and version (e.g., gcc 13, clang 17):
+- CMake version: `cmake --version`:
+- Doxygen/Sphinx versions (if docs-related):
+- `socat` version (if examples-related):
+
+## Additional context
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: Q&A / Usage questions
+    url: https://github.com/NestorDP/cppserial/discussions
+    about: Ask and answer questions, share tips, and propose ideas.
+  - name: Documentation
+    url: https://github.com/NestorDP/cppserial#readme
+    about: Read setup and usage instructions.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+labels: enhancement
+assignees: ''
+---
+
+## Problem
+What problem are you trying to solve? What’s the user story?
+
+## Proposed solution
+Describe the feature and how it should work. Include API shape if applicable.
+
+## Alternatives considered
+List alternative solutions or workarounds you’ve considered.
+
+## Impact
+- Public API changes? [yes/no]
+- Examples/docs updates needed? [yes/no]
+
+## Additional context
+Add any other context or screenshots about the feature request here.

.github/pull_request_template.md

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+## Summary
+
+- What does this PR do? Why is it needed?
+- Link related issues (e.g., Closes #123)
+
+## Changes
+
+- [ ] API changes
+- [ ] Behavior changes
+- [ ] Docs updated
+- [ ] Tests added/updated
+
+### Details
+
+- Briefly list the key changes and files touched
+
+## How to test
+
+- Commands and steps to validate locally
+- Include any environment requirements (Linux only, kernel version, etc.)
+
+## Screenshots/Logs (optional)
+
+- Paste relevant output/logs if helpful
+
+## Checklist
+
+- [ ] Builds locally (Release + Debug)
+- [ ] All tests pass (if applicable)
+- [ ] Lint/format pass: `make cppcheck` / `make cpplint` / `make uncrustify`
+- [ ] Example(s) tested (if touched)
+- [ ] Documentation updated (README/docs)
+
+## Risks and rollbacks
+
+- Potential impact areas, and how to revert if needed