Cleanup repo: remove legacy files, streamline CONTRIBUTING

Author: pavankataria

.github/CONTRIBUTING.md

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+# Contributing Guidelines
+
+Thanks for your interest in contributing to SwiftDataTables!
+
+## Reporting Bugs
+
+Use [GitHub Issues](https://github.com/pavankataria/SwiftDataTables/issues) to report bugs.
+
+Before creating a new issue:
+- Make sure you're using the [latest release](https://github.com/pavankataria/SwiftDataTables/releases)
+- Check if it was [already reported](https://github.com/pavankataria/SwiftDataTables/issues?q=is%3Aissue)
+
+When reporting, include:
+- Xcode and iOS versions
+- Full console output or stack trace
+- Steps to reproduce
+
+## Feature Requests
+
+**[Vote for features](https://swiftdatatables.pavankataria.com/vote)** — your votes shape the roadmap.
+
+## Pull Requests
+
+Look for issues tagged `help wanted` to get started.
+
+- One fix or feature per PR
+- Add tests if possible
+- Update the example project for new features
+- Document any new APIs
+
+### Workflow
+
+1. Fork and clone the repo
+2. Create a feature branch: `git checkout -b my-feature`
+3. Make your changes and commit
+4. Rebase on master: `git pull --rebase upstream master`
+5. Push and open a PR