Ethanahlquist readme updates

[ethanahlquist]

180 Added Setup info to README

What's New?

Added:

• API keys setup
• Curl Query example

Changed:

• file name: nimbus_api.py → flask_api.py

Fixes #180

Type of change (pick-one)

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [x] This change requires a documentation update

[sonarcloud[bot]]

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