add gsp model

[peterdudfield]

Pull Request

Description

moved 'Location' to models/gsp.py

• add gsp yield
• added migrations

Fixes #10

How Has This Been Tested?

added 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 #11 (9fce8af) into main (46de7d6) will decrease coverage by 0.99%.
The diff coverage is 94.85%.

@@            Coverage Diff             @@
##             main      #11      +/-   ##
==========================================
- Coverage   98.61%   97.61%   -1.00%     
==========================================
  Files          11       16       +5     
  Lines         360      503     +143     
==========================================
+ Hits          355      491     +136     
- Misses          5       12       +7     

Impacted Files	Coverage Δ
nowcasting_datamodel/read/read.py	100.00% <ø> (ø)
nowcasting_datamodel/connection.py	93.75% <80.00%> (+4.86%)	⬆️
nowcasting_datamodel/models/gsp.py	88.13% <88.13%> (ø)
nowcasting_datamodel/migrations/app.py	96.87% <96.87%> (ø)
nowcasting_datamodel/__init__.py	100.00% <100.00%> (ø)
nowcasting_datamodel/fake.py	100.00% <100.00%> (ø)
nowcasting_datamodel/models/__init__.py	100.00% <100.00%> (ø)
nowcasting_datamodel/models/base.py	100.00% <100.00%> (ø)
nowcasting_datamodel/models/models.py	100.00% <100.00%> (ø)
nowcasting_datamodel/models/pv.py	100.00% <100.00%> (ø)
... and 2 more

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