feat: Add comprehensive documentation suite and reorganize project structure

- Created complete documentation in docs/ directory
- Added PROJECT_OVERVIEW.md with feature highlights and getting started guide
- Added ARCHITECTURE.md with system design and technical details
- Added SECURITY.md with comprehensive security implementation guide
- Added DEVELOPMENT.md with development workflows and best practices
- Added DEPLOYMENT.md with production deployment instructions
- Added API.md with complete REST API documentation
- Added CONTRIBUTING.md with contribution guidelines
- Added CHANGELOG.md with version history and migration notes
- Reorganized all documentation files into docs/ directory for better organization
- Updated README.md with proper documentation links and quick navigation
- Enhanced project structure with professional documentation standards

tests/Security/BasicSecurityTest.php

@@ -0,0 +1,24 @@
+<?php
+
+use PHPUnit\Framework\TestCase;
+
+class BasicSecurityTest extends TestCase
+{
+    public function testSecurityClassExists()
+    {
+        $this->assertTrue(class_exists('VSecurity'));
+    }
+    
+    public function testBasicInputValidation()
+    {
+        $this->assertEquals(123, VSecurity::validateInput('123', 'int'));
+        $this->assertNull(VSecurity::validateInput('abc', 'int'));
+    }
+    
+    public function testCSRFTokenGeneration()
+    {
+        $token = VSecurity::generateCSRFToken('test');
+        $this->assertIsString($token);
+        $this->assertEquals(64, strlen($token));
+    }
+}