Add git quick reference for sys-apps VPS

Created sys-apps-git-quick-reference.md with basic git commands:
- Daily workflow (add, commit, push)
- Simple explanations
- Common patterns
- When to use finish-up vs manual git

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

sys-apps-git-quick-reference.md

@@ -0,0 +1,87 @@
+# Git Basics - Quick Reference
+
+Simple commands you'll use all the time.
+
+---
+
+## Daily Workflow
+
+### Check what changed
+```bash
+git status              # See what files changed
+git diff                # See exact changes
+```
+
+### Save your work
+```bash
+git add -A                    # Stage ALL changes (new, modified, deleted)
+git commit -m "your message"  # Save with description
+git push origin main          # Upload to Gitea
+```
+
+### Get latest changes
+```bash
+git pull origin main    # Download updates from Gitea
+```
+
+---
+
+## What Each Command Does
+
+| Command | What it does |
+|---------|-------------|
+| `git add -A` | Mark all changes as ready to save |
+| `git commit -m "msg"` | Save marked changes with a description |
+| `git push origin main` | Upload commits to Gitea |
+| `git pull origin main` | Download latest from Gitea |
+| `git status` | Show what changed |
+| `git diff` | Show exact line changes |
+
+---
+
+## Common Patterns
+
+### Made changes, want to save and upload:
+```bash
+git add -A
+git commit -m "Add health checks to services"
+git push origin main
+```
+
+### Want to see what you changed before committing:
+```bash
+git status              # See which files changed
+git diff                # See exact changes
+git add -A              # Stage everything
+git commit -m "..."     # Commit
+git push                # Push
+```
+
+### Get updates from Gitea:
+```bash
+git pull origin main
+```
+
+---
+
+## Remember
+
+- **git add** = Mark files (staging)
+- **git commit** = Save with message (local)
+- **git push** = Upload to Gitea (remote)
+- **-A** = ALL files (new, modified, deleted)
+- **-m** = Message (inline, no editor)
+
+---
+
+## When to Use Finish-Up Agent vs Manual Git
+
+**Use finish-up agent:**
+- Ending work session
+- Want comprehensive documentation
+- Need session summary
+
+**Use manual git:**
+- Quick commits during work
+- Custom commit messages
+- Frequent small saves