Create CONTRIBUTING.md

Initial CONTRIBUTING commit

Author: GhostwheeI

CONTRIBUTING.md

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+# Contributing to Redterm
+
+Thank you for your interest in improving Redterm!
+
+## Quick Start
+
+- Fork and clone this repo.
+- Use `redterm.ps1` on Windows to test.
+- All logging, clipboard, and prompt features should be customizable through CLI or in-script settings.
+- Keep all documentation up to date (README, man page drafts, usage notes).
+- Submit PRs with a clear summary of what was changed or improved.
+
+## Code Style
+
+- PowerShell: use `UTF-8` encoding for scripts.
+- Prefer `Write-Host` for user prompts, `Out-File` for logs.
+- Keep functions self-contained and document public functions with PowerShell-style comments.
+- Name parameters clearly: e.g., `-LogSizeMB`, `-Clipboard`, `-LogPath`.
+- Test for edge cases: large logs, permission issues, clipboard errors.
+
+## Commits & Branches
+
+- Use descriptive branch names, e.g., `feature/env-sync`, `fix/clipboard-tail`.
+- Reference issues in commit messages when relevant.
+- Keep commits focused; avoid "mega-commits" that touch everything at once.
+
+## Issues & Feature Requests
+
+- Use the issue tracker for bugs, ideas, or enhancement suggestions.
+- Please specify:
+  - OS version & PowerShell version
+  - What you expected vs what happened
+  - Any relevant log excerpts
+
+## Security
+
+- Do **not** log secrets or credentials.
+- Avoid transmitting logs off-machine unless encryption is implemented (future roadmap).
+
+Thank you for helping make Redterm better!