docs: Updated README.

README.md

@@ -5,31 +5,30 @@
 [![License: MIT](https://img.shields.io/github/license/tryAGI/AI21)](https://github.com/tryAGI/AI21/blob/main/LICENSE.txt)
 [![Discord](https://img.shields.io/discord/1115206893015662663?label=Discord&logo=discord&logoColor=white&color=d82679)](https://discord.gg/Ca2xhfBf3v)
 
-Generated C# SDK based on AI21 OpenAPI specification using NSwag.  
-Includes [tokenizer](https://github.com/tryAGI/Tiktoken) and some helper methods.
+## Features 🔥
+- Fully generated C# SDK based on [official OpenAPI specification](https://api.ai21.com/openapi.json) using [OpenApiGenerator](https://github.com/HavenDV/OpenApiGenerator)
+- Same day update to support new features
+- Updated and supported automatically if there are no breaking changes
+- All modern .NET features - nullability, trimming, NativeAOT, etc.
+- Support .Net Framework/.Net Standard 2.0
 
 ### Usage
 ```csharp
 using AI21;
 
-using var client = new HttpClient();
-var api = new AI21Api(apiKey, client);
-var response = await api.GenerateTextAsync(
-    RecommendedModelIds.Gpt2,
-    new GenerateTextRequest
-    {
-        Inputs = "Hello",
-        Parameters = new GenerateTextRequestParameters
-        {
-            Max_new_tokens = 250,
-            Return_full_text = false,
-        },
-        Options = new GenerateTextRequestOptions
+usung var api = new Ai21Api(apiKey);
+
+await api.Chat.V1J2UltraChatAsync(
+    messages:
+    [
+        new ChatMessage
         {
-            Use_cache = true,
-            Wait_for_model = false,
-        },
-    });
+            Text = "Hello",
+            Role = RoleType.User,
+        }
+    ],
+    system: string.Empty,
+    cancellationToken: CancellationToken.None);
 ```
 
 ## Support