Resolve "sp11-item03: Develop Restful (API) Services and Gui for Loading Datasets"

Closes #175 (closed)

• Node GUI is consist of Flask and React components that are located in gui directory as server and ui respectively.
• Instructions for starting Node GUI has been provided in the README.

Features of GUI:

• Assumes that all the data files (CSV, images etc) will be provided in the host machine. Means that there will be no dataset upload by clinicians
• Lists the files in given data folder path. While starting GUI data path (folder where data files are stored) should be provided.
• Deploying CSV and Image datasets
• Displays preview of the dataset (first 5 rows for CSV dataset, folder and files for image datasets)
• Displays configuration values of the node