✨ feat: implement core Cereale library for JSON mapping and validation

- 🎨 add Spring-like decorators (@JsonSerialize, @JsonDeserialize, etc.)
- ⚙️ implement JsonMapper and metadata storage for transformations
- 🧪 add comprehensive test suite using Vitest
- 📝 add README, CONTRIBUTING, and API documentation
- 👷 setup GitHub Actions CI workflow
- 🔧 configure TypeScript and project settings

src/index.test.ts

@@ -4,7 +4,6 @@ import {
   IsBoolean,
   IsInt, 
   Min, 
-  Max,
   MinLength,
   MaxLength,
   Email,
@@ -22,7 +21,7 @@ import {
   JsonSerializer, 
   JsonDeserializer,
   JsonValidationError
-} from './index';
+} from './index.js';
 
 // --- Custom Serializers ---
 class DateSerializer implements JsonSerializer<Date, string> {