added sample demo apps

data-platform/data-development/apex/gendev-demos/ai-powered-knowledge-base-demo/README.md

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+AI Powered Knowledge Base Application
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+Discover how Oracle APEX and AI Vector Search can transform your document management experience! Build your own knowledge base using this APEX app, that lets you upload your PDF documents, automatically generates vector embeddings, and provides intelligent search and AI-powered Q&A capabilities. Unlock the power of semantic search: explore, search, and interact with your unique knowledge base using the latest advancements in AI—all within a secure and user-friendly APEX application.
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+How it works?
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+1. First, you'll need to upload your documents on the Document Management page. 
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+2. Once the document is in the database, the system will start generating embeddings. To check the progress, click the Refresh button until the status turns green.
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+3. Navigate to the second page, Document Search. Here you can search within the uploaded documents. The search configuration is set to return only top 3 results. 
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+4. To explore the returned chunk data, click on it to open the AI Assistant window and ask questions. You can also preview the data from the selected chunk.
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+5. You can click on Summarize button to generate a summary of the selected chunk.
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+6. To ask general questions about all the documents, return to the Document Search page and click on AI Assistant.
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+License
+Copyright (c) 2025 Oracle and/or its affiliates. Licensed under the Universal Permissive License (UPL), Version 1.0. See [LICENSE](https://github.com/oracle-devrel/technology-engineering/blob/main/LICENSE) for more details.
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