Main docs README

Author: jchavannes

docs/README.md

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+# Go Library API Documentation
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+The documentation is split into various pages, each covering a set of related functionality. The pages are as follows:
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+- [Concepts](./concepts/) — Covers high-level concepts and architecture of the Go SDK.
+- [Examples](./examples/) — Provides practical examples of how to use the Go SDK.
+- [Low-Level](./low-level/) — Details low-level operations and functionalities within the SDK.