Add Contributor Guide to provide instructions for contributing to the CMS User Guide

Author: swu4bnl

Globus_Guide.md

@@ -0,0 +1,60 @@
+# Contributor Guide
+
+Welcome! This guide explains how to contribute to the CMS User Guide using mdBook.
+
+## How mdBook Works
+- All content lives in the `src/` directory as Markdown files.
+- The book structure is defined in `src/SUMMARY.md`.
+- When you push changes to the `main` branch, the book is automatically rebuilt and published to GitHub Pages.
+
+## How to Add or Edit Content
+
+### Add a New Chapter/Page
+1. Create a new Markdown file in `src/` (e.g., `src/New_Chapter.md`).
+2. Add a link to your new file in `src/SUMMARY.md`:
+   ```
+   - [New Chapter](./New_Chapter.md)
+   ```
+3. Commit and push your changes to `main`.
+
+### Edit Existing Content
+- Edit the relevant Markdown file in `src/`.
+- Commit and push your changes.
+
+### Organize Chapters
+- Use `src/SUMMARY.md` to set the order and hierarchy of chapters.
+- Indent chapters under parents for nesting.
+
+### Preview Locally (Optional)
+1. Install mdBook (if not already):
+   - macOS: `brew install mdbook`
+   - Linux: `cargo install mdbook`
+   - Windows: Download from [mdBook releases](https://github.com/rust-lang/mdBook/releases)
+2. Run `mdbook serve` in the repo directory.
+3. Open `http://localhost:3000` in your browser.
+
+## Best Practices
+- Always update `src/SUMMARY.md` when adding/removing/reordering chapters.
+- Use clear filenames and titles.
+- Preview locally before pushing.
+- Commit related changes together.
+
+## Need Help?
+- Open an issue or ask in the repository discussions.
+
+Thank you for contributing!
+
+## Useful Links
+
+- **Markdown Reference:**
+  - [Markdown Guide (Comprehensive)](https://www.markdownguide.org/)
+  - [GitHub Flavored Markdown Spec](https://github.github.com/gfm/)
+  - [mdBook User Guide](https://rust-lang.github.io/mdBook/)
+- **Markdown Editors:**
+  - [Typora](https://typora.io/) — Live preview, cross-platform
+  - [Mark Text](https://marktext.app/) — Free, open-source, cross-platform
+  - [Obsidian](https://obsidian.md/) — Powerful knowledge base, free for personal use
+  - [VS Code](https://code.visualstudio.com/) — With built-in Markdown preview
+- **Other Tools:**
+  - [Dillinger](https://dillinger.io/) — Online Markdown editor
+  - [StackEdit](https://stackedit.io/) — Online Markdown editor with cloud sync

Python_Starter_Guide_win64.md

@@ -8,3 +8,7 @@
 - [Python Starter Guide](./Python_Starter_Guide_win64.md)
 - [runXS.py Starter Guide](./runXS_Starter_Guide_win64.md)
 - [Beamline Quick Start Guide](./Beamline_Quick_Start.md)
+
+# To Contributors
+
+- [Contributor Guide](./CONTRIBUTING.md)