Add readme for generatedocstring patchflow

[codelion]

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[patched-admin]

The GenerateDocstring patchflow automates the process of generating docstrings for methods in code by extracting methods from a specified base path and using gpt-3.5-turbo to create docstrings. The changes are saved in a new branch and a pull request is created for review and merging. Users have the flexibility to configure the model, base path, rewriting existing docstrings, managing pull requests, and the prompt template. The document includes examples of generated pull requests using this patchflow.

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• File changed: patchwork/patchflows/GenerateDocstring/README.md
  The GenerateDocstring patchflow automatically generates docstrings for methods in code, starts from a specified base path to extract methods, sends the extracted methods to gpt-3.5-turbo to generate docstrings, saves the changes in a new branch, and creates a pull request for review and merging. Users can configure the model, base path, rewriting existing docstrings, managing pull requests, and the prompt template. Examples of generated pull requests with this patchflow are provided at the end of the document.