genai README update + Basic Testing

packages/genai/test/utils.dart/ai_request_utils_test.dart

@@ -0,0 +1,30 @@
+import 'dart:async';
+import 'dart:convert';
+
+import 'package:flutter_test/flutter_test.dart';
+import 'package:genai/models/ai_request_model.dart';
+import 'package:genai/interface/consts.dart';
+import 'package:genai/utils/ai_request_utils.dart';
+import 'package:better_networking/better_networking.dart';
+
+const kTestingAPIKey = "AIzaSyAtmGxNxlbh_MokoDbMjHKDSW-gU6GCMOU";
+
+void main() {
+  group('ai_request_utils', () {
+    test(
+      'executeGenAIRequest should return formatted output on success',
+      () async {
+        const model = AIRequestModel(
+          modelApiProvider: ModelAPIProvider.gemini,
+          model: 'gemini-2.0-flash',
+          url: kGeminiUrl,
+          userPrompt: 'Convert the Given Number into Binary',
+          systemPrompt: '1',
+          apiKey: kTestingAPIKey,
+        );
+        final result = await executeGenAIRequest(model);
+        expect(result, isNotNull);
+      },
+    );
+  });
+}