docs: add ADK Connector integration guide

[Harshk133]

Description

This PR adds integration documentation and branding assets for ADK Connector, a third-party integration for Google Agent Development Kit (ADK).

ADK Connector enables developers to wrap Google ADK agents (Python and JavaScript/TypeScript) and deploy them as chatbots on messaging platforms such as Telegram, Discord, WhatsApp, and Slack with minimal setup.

Additionally, it provides optional database-backed session synchronization, allowing conversations to be shared between messaging platforms and the local ADK Web UI (adk web).

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Changes

Documentation

• Added integration guide:

  • docs/integrations/adk-connector.md

Assets

• Added integration logo:

  • docs/integrations/assets/adk-connector.png

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Integration Highlights

• Deploy ADK agents to messaging platforms with minimal code changes.
• Supports both Python and JavaScript/TypeScript ADK agents.
• Cross-device session synchronization with ADK Web UI.
• Persistent session management backed by database storage.
• Extensible architecture for additional messaging platforms.

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Acceptance Criteria Checklist

• Completeness and Testability
  Includes complete and functional examples for both Python and JavaScript/TypeScript that developers can copy, run, and validate.

• Developer Value
  Provides quick-start integration instructions along with advanced configuration options for deploying ADK agents to messaging platforms.

• Publishability
  The integration is open source, uses publicly available APIs, and complies with platform terms of service.

• Local Verification
  Documentation was validated locally using:

  mkdocs build

  All links, assets, and Markdown rendering were verified successfully.

• Google CLA
  Google Contributor License Agreement has been signed (or is ready to be signed).

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[Harshk133]

Hi,

I've updated this PR to include the documentation, configuration, and setup guides for the newly added Discord Connector, alongside the existing Telegram Connector support.

Changes included

• Added Discord bot credentials and setup instructions to the Prerequisites section.
• Added a Python (Discord) example to the Use with Agent section.
• Updated the Advanced Setup documentation to demonstrate cross-device session synchronization using adk web for both Telegram and Discord connectors.

Please let me know if there is any additional feedback or if further changes are required. Thanks!

[koverholt]

Thanks for contributing this PR and integration! I verified the packages and API against source. I made some minor edits: generalized the channel references to defer to the repo, switched examples to gemini-flash-latest, and shortened the session-sync heading. LGTM, merging.

[Harshk133]

Thank you for merging ADK Connectors into the official integrations! This is a huge milestone. Looking forward to collaborating with the community. Next up: Slack support. 🚀