Add documentation for standalone LLM tool usage.

tools/standalone_llm_tool.md

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+# Standalone LLM Tool
+
+## Overview
+The Standalone LLM Tool is designed to interact with a preview version of a Large Language Model (LLM) independently. This tool utilizes advanced reasoning and coding capabilities to generate responses based on user input prompts.
+
+## Setup
+1. **Environment Variables**: Ensure that the `OPENAI_API_KEY` is set in your environment to authenticate API requests.
+2. **Dependencies**: Make sure all dependencies are installed as per `requirements.txt`.
+
+## Usage
+- Run the tool via the command line:
+  ```bash
+  python standalone_llm_tool.py
+  ```
+- Enter a prompt when prompted:
+  ```
+  Enter your prompt: <Your detailed prompt here>
+  ```
+- View the detailed response provided by the LLM preview model.
+
+## Features
+- **LLM Model**: Utilizes a designated LLM preview model for processing.
+- **Prompt Handling**: Accepts user input and returns comprehensive instructions or code snippets.
+- **Advanced Reasoning**: Leverages the model's capabilities for enhanced reasoning and coding tasks.
+
+## Notes
+- This tool is designed for standalone execution and does not integrate with Telegram or other platforms.
+- The model used here is intended for generating detailed narratives or solving coding-related queries, thanks to its preview features.
+
+## Troubleshooting
+For any issues encountered while using the tool, consider the following:
+- Verify API key validity and quota.
+- Ensure your Python environment is correctly set up with necessary dependencies.
+- Refer to any console logs for specific error messages to aid in debugging.