create documentation for spring AI

Author: Yuriy Bezsonov

samples/spring-ai/README.md

@@ -41,6 +41,8 @@ The AI Assistant is the central application in the ecosystem, providing:
 - PostgreSQL with pgvector for vector embeddings
 - Thymeleaf web interface
 
+![assistant-ui](assistant/docs/assistant-ui.png)
+
 ### [Travel Service](travel/README.md)
 
 The Travel service provides specialized functionality for travel management:

samples/spring-ai/assistant/README.md

@@ -43,6 +43,8 @@ This application serves as:
 - **Thymeleaf**: Server-side templating for the web interface
 - **Docker**: Containerization for database and application
 
+![assistant-ui](docs/assistant-ui.png)
+
 ## Architecture
 
 ### Component Architecture