docs: add documentation entry pages

Author: loong-solvable

docs/index.md

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+# Swarms Documentation
+
+Swarms is a framework for building and orchestrating production multi-agent systems.
+
+Use this documentation to find installation notes, agent guides, orchestration patterns, examples, tooling references, and contributor information.
+
+## Start Here
+
+- Quickstart: see the quickstart guide.
+- Agents: see the agent overview.
+- Multi-agent architectures: see the orchestration overview.
+- Contributors: see the contributor guide.

docs/quickstart.md

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+# Quickstart
+
+This quickstart points new readers to the main onboarding paths in the documentation.
+
+## Install
+
+Start with the installation guide in the Swarms onboarding section.
+
+## Build An Agent
+
+Read the agents overview, then choose a basic agent example that matches your use case.
+
+## Choose An Architecture
+
+For multi-agent systems, review the architecture overview and the guide for choosing a swarm pattern.
+
+## Explore Examples
+
+The examples section contains practical agent, workflow, tool, and deployment walkthroughs.