Create README.md

Signed-off-by: Marcel Kwiatkowski <[email protected]>

README.md

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+# FunctionalGPT
+Lightweight C#/.NET OpenAI API wrapper with support of GPT function calling via reflection.
+> [!NOTE] 
+> Function calling is not yet supported *(coming soon)*.
+
+## Usage
+### Simple Prompt
+``` cs
+using FunctionalGPT;
+
+var chatGPT = new ChatGPT("<OPENAI API KEY>", "gpt-3.5-turbo");
+var response = chatGPT.CompleteAsync("Write an article about bitcoin.");
+
+Console.WriteLine(response);
+```
+
+### Conversation
+```cs
+using FunctionalGPT;
+
+var chatGPT = new ChatGPT("<OPENAI API KEY>", "gpt-3.5-turbo");
+var conversation = new Conversation("You are a helpful assistant [...]");
+
+while (true)
+{
+    var userMessage = Console.ReadLine()!;
+    conversation.FromUser(userMessage);
+
+    var assistantResponse = await chatGPT.CompleteAsync(conversation);
+    Console.WriteLine(assistantResponse);
+}
+```
+> [!IMPORTANT] 
+> Assistant replies are automatically added to the conversation.
+
+### Conversation with Multiple Users
+```cs
+using FunctionalGPT;
+
+var chatGPT = new ChatGPT("<OPENAI API KEY>", "gpt-3.5-turbo");
+var conversation = new Conversation("Decide who is right and explain why.");
+
+conversation.FromUser("Alice", "I think the egg came first.");
+conversation.FromUser("Bob", "Nah, it must have been chicken.");
+
+var response = await chatGPT.CompleteAsync(conversation);
+Console.WriteLine(response);
+```