adding file writer tool and documentation

src/crewai_tools/tools/file_writer_tool/README.md

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+Here's the rewritten README for the `FileWriterTool`:
+
+# FileWriterTool Documentation
+
+## Description
+The `FileWriterTool` is a component of the crewai_tools package, designed to simplify the process of writing content to files. It is particularly useful in scenarios such as generating reports, saving logs, creating configuration files, and more. This tool supports creating new directories if they don't exist, making it easier to organize your output.
+
+## Installation
+Install the crewai_tools package to use the `FileWriterTool` in your projects:
+
+```shell
+pip install 'crewai[tools]'
+```
+
+## Example
+To get started with the `FileWriterTool`:
+
+```python
+from crewai_tools import FileWriterTool
+
+# Initialize the tool
+file_writer_tool = FileWriterTool()
+
+# Write content to a file in a specified directory
+result = file_writer_tool._run('example.txt', 'This is a test content.', 'test_directory')
+print(result)
+```
+
+## Arguments
+- `filename`: The name of the file you want to create or overwrite.
+- `content`: The content to write into the file.
+- `directory` (optional): The path to the directory where the file will be created. Defaults to the current directory (`.`). If the directory does not exist, it will be created.
+
+## Conclusion
+By integrating the `FileWriterTool` into your crews, the agents can execute the process of writing content to files and creating directories. This tool is essential for tasks that require saving output data, creating structured file systems, and more. By adhering to the setup and usage guidelines provided, incorporating this tool into projects is straightforward and efficient.

src/crewai_tools/tools/file_writer_tool/file_writer_tool.py

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+import os
+from crewai_tools import BaseTool
+
+class FileWriterTool(BaseTool):
+    name: str = "File Writer Tool"
+    description: str = "A tool to write content to a specified file. Accepts filename, content, and optionally a directory path as input."
+
+    def _run(self, filename: str, content: str, directory: str = '.') -> str:
+        try:
+            # Create the directory if it doesn't exist
+            if directory and not os.path.exists(directory):
+                os.makedirs(directory)
+
+            # Construct the full path
+            filepath = os.path.join(directory, filename)
+
+            # Write content to the file
+            with open(filepath, 'w') as file:
+                file.write(content)
+            return f"Content successfully written to {filepath}"
+        except Exception as e:
+            return f"An error occurred while writing to the file: {str(e)}"