o Add README

Author: rajeeja

.github/workflows/README.md

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+# Docker Parsl GraphDRP CSA Workflow (docker_gdrp_parsl.yml)
+
+This GitHub Actions workflow is designed to automate the testing and execution of the GraphDRP CSA (Cross-Species Analysis) workflow using Docker. The workflow performs the following steps:
+
+1. **Checkout the Repository**: The workflow checks out the IMPROVE repository code.
+2. **Install Missing Libraries**: Installs necessary system libraries such as `libxrender1`, `libxext6`, and `tree`.
+3. **Install and Check**: Verifies the Python and Conda environments, activates the `GraphDRP` Conda environment (already has csa-data downloaded), and installs the required Python packages.
+4. **Run Preprocessing and CSA Workflows**: Executes the preprocessing and Parsl CSA workflows using the specified configuration files.
+## Configuration Files
+
+The workflow uses the following configuration files:
+
+- **`parsl_csa_githubactions.ini`**: This configuration file is used to set up the parameters for the Parsl CSA workflow. It includes settings for data paths, model parameters, and other relevant configurations.