The End Client can specify the time period to get electricity information about

[RiinaLi]

AS A Product Owner
I WANT the end client to be able to specify a time period to get electricity information about
SO THAT they can receive data for a custom range of dates

Acceptance Criteria

• The End Client can specify the time period to get electricity information about
• The system should allow the end client to specify a start and end date for the desired time period
• The system should handle different time periods such as days, weeks, or months

[matKlju]

Added time-period service.
80-electricity-service

[turnerrainer]

Code added straight to #80 without pull requests

[ffrose]

As of right now, will proceed using only information about "today".