Issue/39 gsp installed capacity

[peterdudfield]

Pull Request

Description

add installed capacity to gsp locations

Fixes #39

How Has This Been Tested?

normal unittests

• [ ] Yes

Checklist:

• [ ] My code follows OCF's coding style guidelines
• [ ] I have performed a self-review of my own code
• [ ] I have made corresponding changes to the documentation
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] I have checked my code and corrected any misspellings

[codecov-commenter]

Codecov Report

Merging #40 (216fbac) into main (04815bc) will increase coverage by 0.00%. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main      #40   +/-   ##
=======================================
  Coverage   98.33%   98.34%           
=======================================
  Files          16       16           
  Lines         602      604    +2     
=======================================
+ Hits          592      594    +2     
  Misses         10       10           

Impacted Files	Coverage Δ
nowcasting_datamodel/__init__.py	100.00% <100.00%> (ø)
nowcasting_datamodel/models/gsp.py	93.65% <100.00%> (+0.20%)	:arrow_up:

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