Add doc readme (#85)

Author: yuhuang-wang

docs/README.md

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+# seekdb Documentation
+
+Visit the [seekdb-doc](https://github.com/oceanbase/seekdb-doc) repository to view the official documents for seekdb, the AI-native search database that unifies relational, vector, text, JSON and GIS in a single engine to enable hybrid search and in-database AI workflows.
+
+The seekdb-doc repository hosts the full set of seekdb documentation, including product overview, developer guides, tutorials, and integration references.
+
+[Documentation site](https://www.oceanbase.ai/docs/seekdb-overview/)
+
+## Explore the Docs
+
+|Section|Description|
+|---|---|
+|Get Started|Learn the basics of seekdb and quickly build your first AI application.|
+|Develop|End-to-end development workflows using SQL and the seekdb SDK.|
+|Integrations|Explore seekdb's integrations with popular AI frameworks, model platforms, and more.|
+|Guides|Deployment, configuration, and management guides for running seekdb in various environments.|
+|Tutorials|Step-by-step walkthroughs showcasing seekdb's core capabilities and how to build AI applications.|
+|Demos|Interactive demos showing how seekdb addresses real-world database scenarios.|
+
+## Feedback & Contributions
+
+We welcome your ideas, bug reports, and improvements!
+
+If you run into issues or something in the docs feels unclear:
+
+* Open an issue, or
+* Submit a pull request with your proposed fixes or enhancements.
+
+Your feedback helps us make seekdb better for everyone.