feat: demo project readme

src/LLMServiceHub/README.md

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+# An MVC Webapp demonstration
+
+## Content
+
+In this project,we build a demonstration of SDK usage,including:
+
+1. ChatGPT service integration.
+    + chat in text.
+    + limited parameters.
+    + multi-round chat.
+    + Server-Sent Event support.
+1. Baidu Erniebot service integration.
+    + chat in text.
+    + limited parameters.
+    + multi-round chat.
+    + Server-sent Event support.
+1. Baidu ErnieVilg V2 painting service integration.
+    + text2img.
+    + various image size.
+    + local image storage.
+1. Inmemory caching of chat hitory.
+1. Storaging text2image generation to local disk.
+1. WebApi with `swashbuclke` documentation support.
+1. Mvc & .net8.0 driven.
+1. A simple local user authentication(without database).
+1. AzureAD authentication integration,demonstrating login with tenantid insensitive MS personal account or MS Work or school account.