Add PR submission checklist and screenshot recommendations

PR_SUBMISSION_CHECKLIST.md

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+# Preinstall Enhancements PR - Submission Checklist
+
+## PR Information
+
+**Title**: Enhanced run_comfyui.bat with Automated Dependency Checking and CUDA PyTorch Installation
+
+**Branch**: `preinstall-enhancements`  
+**Base**: `master`  
+**Status**: ✅ Ready for Submission
+
+## Files Included
+
+- ✅ `run_comfyui.bat` - Enhanced startup script
+- ✅ `create_shortcut.ps1` - Desktop shortcut helper
+- ✅ `PREINSTALL_ENHANCEMENTS_PLAN.md` - Plan document
+- ✅ `PR_DESCRIPTION.md` - Complete PR description
+
+## Commits
+
+1. `1365bbf8` - Enhanced run_comfyui.bat with UTF-8 encoding, progress bars, and CUDA PyTorch auto-installation
+2. `f65290f9` - Add create_shortcut.ps1 for desktop shortcut creation
+3. `52d13ef3` - Add plan document for preinstall enhancements PR
+4. `1a56b1dc` - Add comprehensive PR description for preinstall enhancements
+
+## Recommended Screenshots
+
+### 1. ASCII Art Banner (High Priority)
+**What to capture**: The ASCII art banner showing "Comfy" text
+**Why**: Shows the polished, professional appearance of the script
+**When**: Right after running the script
+
+### 2. Dependency Checking Prompt (High Priority)
+**What to capture**: The prompt showing missing dependencies with installation options
+**Why**: Demonstrates the automated dependency checking feature
+**When**: When critical dependencies are missing
+
+### 3. CUDA PyTorch Detection (High Priority)
+**What to capture**: The CPU-only PyTorch detection message and installation offer
+**Why**: Shows the automatic CUDA PyTorch detection and installation feature
+**When**: When CPU-only PyTorch is detected
+
+### 4. Progress Bar During Installation (Medium Priority)
+**What to capture**: Progress bar showing during pip installation (especially PyTorch)
+**Why**: Demonstrates the progress bar feature for long installations
+**When**: During pip install with `--progress-bar on`
+
+### 5. Virtual Environment Detection (Medium Priority)
+**What to capture**: Message showing virtual environment detection
+**Why**: Shows the virtual environment awareness feature
+**When**: When running in a virtual environment
+
+### 6. Error Message Example (Low Priority)
+**What to capture**: One of the user-friendly error messages with troubleshooting steps
+**Why**: Demonstrates improved error handling
+**When**: When an error occurs (e.g., Python not found)
+
+## PR Description
+
+The complete PR description is in `PR_DESCRIPTION.md` and includes:
+- ✅ Author's note about coding experience
+- ✅ Overview of changes
+- ✅ Key features list
+- ✅ Files changed
+- ✅ Screenshot placeholders (ASCII art examples)
+- ✅ Testing recommendations
+- ✅ Technical details
+- ✅ Backward compatibility notes
+- ✅ Benefits section
+- ✅ Request for review
+
+## Pre-Submission Checklist
+
+- [x] All changes committed to `preinstall-enhancements` branch
+- [x] Branch is based on `master`
+- [x] PR description written
+- [x] Plan document included
+- [x] Code tested
+- [ ] Screenshots captured (optional but recommended)
+- [ ] Final review of PR description
+- [ ] Ready to submit to upstream repository
+
+## Submission Steps
+
+1. **Push branch to your fork**:
+   ```bash
+   git push origin preinstall-enhancements
+   ```
+
+2. **Create PR on GitHub**:
+   - Go to the upstream repository
+   - Click "New Pull Request"
+   - Select `preinstall-enhancements` as source branch
+   - Select `master` as target branch
+   - Copy PR description from `PR_DESCRIPTION.md`
+   - Add screenshots if available
+   - Submit PR
+
+3. **Monitor PR**:
+   - Respond to review comments
+   - Make requested changes if needed
+   - Update branch as necessary
+
+## Notes
+
+- The PR description is comprehensive and ready to use
+- Screenshots are optional but would enhance the PR
+- All code has been tested
+- Branch is clean and ready for submission
+