[STABLE] Add development framework documentation

TESTING.md

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+# WP Allstars Plugin Testing Procedures
+
+This document outlines the testing procedures for the WP Allstars Plugin to ensure stability and reliability.
+
+## Pre-Merge Testing Checklist
+
+### Basic Functionality Tests
+
+- [ ] Plugin activates without errors
+- [ ] Plugin deactivates without errors
+- [ ] Admin menu appears correctly
+- [ ] All submenu items load without errors
+- [ ] Settings can be saved without errors
+- [ ] Plugin works with WordPress debug mode enabled
+
+### Feature-Specific Tests
+
+Each new feature should have its own testing checklist added here.
+
+#### Multisite Category Feature
+
+- [ ] "Multisite" category appears in the correct location in the UI
+- [ ] Network Plugin Auditor appears in the Multisite category
+- [ ] Category filter works when clicked
+- [ ] Plugin can be installed from the category
+
+#### Sync Guard Feature
+
+- [ ] Plugin doesn't load when .syncing file is present
+- [ ] .syncing file is created during sync operations
+- [ ] .syncing file is removed after sync completes
+- [ ] User is notified when plugin is in sync mode
+
+### Compatibility Tests
+
+- [ ] Plugin works with latest WordPress version
+- [ ] Plugin works with PHP 7.4+
+- [ ] Plugin works with common themes (Twenty Twenty-Three, Kadence)
+- [ ] Plugin co-exists with other popular plugins without conflicts
+
+### Browser Compatibility
+
+- [ ] UI works correctly in Chrome
+- [ ] UI works correctly in Firefox
+- [ ] UI works correctly in Safari
+- [ ] UI works correctly in Edge
+
+### Mobile Responsiveness
+
+- [ ] Admin interface is usable on mobile devices
+- [ ] No layout issues on small screens
+
+## Testing Process
+
+1. Create a clean WordPress installation for testing
+2. Install and activate the plugin
+3. Enable WordPress debug mode (WP_DEBUG = true)
+4. Complete all tests in the checklist
+5. Document any issues found
+6. Fix issues and retest
+7. Only mark as [STABLE] when all tests pass
+
+## Continuous Integration
+
+For future implementation:
+
+- [ ] Automated unit tests
+- [ ] Integration tests
+- [ ] End-to-end tests
+- [ ] Code quality checks