Requirements and Fix: Add requirements.txt and update imports for LangChain 0.2.0+imports

[douha1995]

Summary

This PR fixes runtime errors and warnings in the starter_template crew example caused by outdated imports and missing dependencies.

Changes

• Added requirements.txt with the following dependencies:
  • python-decouple
  • langchain
  • langchain-community
  • openai
  • duckduckgo-search
  • ddgs
  • crewai
• Updated imports:
  • from langchain.llms → from langchain_community.llms
  • from langchain.tools → from langchain_community.tools
• Patched agents.py and main.py to use the updated imports.

Motivation

Running python main.py in the current repo results in:

• ImportError: Could not import ddgs python package
• Multiple LangChainDeprecationWarning messages

With these changes, the project runs correctly out-of-the-box.

Testing

Steps tested locally:

python -m venv venv
source venv/bin/activate   # or venv\Scripts\activate on Windows
pip install -r requirements.txt
python main.py