Test Procedure for adding new dataset with NREL

[trevorb1]

Link to dataset: https://atb.nrel.gov/electricity/2022/data

Successful PR Includes:

• [x] Script to download dataset (requests library)
  • [ ] Check out and add to datareader
• [x] General function functions for interacting with dataset
• [x] Simple example of use in docstrings (see here)
• [ ] Create example jupyter notebook to show use case for the dataset

[trevorb1]

Completed and tested