docs: add langchain integration

[tobySolutions]

This pull request adds the langchain integration documentation with Gaia. In this demo I have used the integration with a local Gaia node. There seems to be some issues with using some of the public nodes that I have reported in the priv-devrel channel.

Thank you 🫡 .

[juntao]

Hello, I am a PR summary agent on flows.network. Here are my reviews of code commits in this PR.

---

Overall Summary

Potential Issues and Errors:

1. Typo: The Python snippet contains a typo (reponse instead of response).
2. Incomplete Sentence: The sentence "you can use a string like: 'Gaia'." is incomplete and should be clarified.
3. Trailing Newline Character: The document ends with \ No newline at end of file, indicating an inconsistency in file formatting.
4. Grammar and Style: Additional grammatical or stylistic inconsistencies may exist and need review.

Key Findings:

1. Documentation Structure: The new langchain.md file is properly positioned as the 9th item in the sidebar under docs/agent-integrations.
2. Content Coverage: The document comprehensively covers setup prerequisites, code snippets (JavaScript and Python), and integration details with Gaia nodes.
3. Enhancements:
   • Added detailed information on integrations with LangGraph and LangSmith.
   • Clarified API key requirements and setup instructions for JavaScript and Python projects.
   • Reorganized content into distinct sections like "Setup" and "Invoking Gaia Models".
4. Code Snippets: Included necessary import statements (import os) to ensure functionality.

Recommendations:

• Fix the typo in the Python snippet (reponse -> response).
• Clarify the incomplete sentence about using a string like "Gaia".
• Remove the trailing newline character for consistent file formatting.
• Review and correct any additional grammatical or stylistic inconsistencies.

Details

Commit 78d9b52dde26ce413e174768717befafbf108d22

Key Changes and Findings:

1. New Documentation File: Added a new Markdown file langchain.md under docs/agent-integrations.
2. Sidebar Positioning: The document is set to appear as the 9th item in the sidebar.
3. Content Overview:
   • Explains LangChain integration with Gaia nodes.
   • Provides setup prerequisites, including running own node or using public node options.
4. Code Snippets:
   • Included JavaScript and Python code snippets for integrating LangChain with a Gaia node.
5. Notes and Corrections:
   • Minor typo in the Python snippet (reponse instead of response).
   • Incomplete sentence: "you can use a string like: 'Gaia'." should be corrected to clarify context.
6. Formatting Issues: The final line \ No newline at end of file indicates a minor formatting issue that should be addressed for consistency.

Recommendations:

• Fix the typo in the Python snippet (reponse -> response).
• Clarify the incomplete sentence about using a string like "Gaia".
• Ensure consistent code block indentation and format.
• Review for any additional grammatical or stylistic inconsistencies.

Commit 377f7459a5ca89e93528395f9c15ed3958ab15fe

-### Key Changes:

1. Updated Integration Information: Added details about LangChain integrations with LangGraph and LangSmith, enhancing the documentation for users.
2. Formatting Fix: Removed a trailing newline character, ensuring consistent file formatting.

Commit bb318f264de94196c48a4a51c769f8321337ab7d

Key Changes:

1. Added Import Statement: Added import os to the Python code snippet for accessing environment variables.

This is a minor update focusing on ensuring proper import statements are present in the example code for clarity and functionality.

Commit a34d7009b00348b93a10231cc192d1feb1baaf8d

Key Changes Summary

1. Clarified API Key Requirement: Updated the text to specify that free 50,000 API credits are available when applying for a developer account.
2. Added Setup Instructions:
   • Included detailed setup steps for both JavaScript and Python projects, including installation commands using npm and pip.
3. Reorganized Content:
   • Moved the Gaia node setup instructions into a new "Setup" section for better clarity.
4. Updated Integration Section:
   • Provided guidance on setting up a .env file to store API keys and clarified that an API key isn't needed when running the node locally.
5. Enhanced Code Snippets:
   • Improved formatting and organization of code snippets in both JavaScript and Python tabs, including comments and removed redundant lines.
6. Added Invoking Gaia Models Section:
   • Created a new section detailing how to invoke models using LangChain, with example code for both JavaScript and Python.

These changes improve the clarity and completeness of the documentation for integrating Langchain with Gaia.