Test updates

[telegraphic]

Addresses #27 and adds some basic unit tests for missing files

[what-the-diff[bot]]

PR Summary

• Introduction of .gitignore file A new .gitignore file has been set up to house multiple files and directory patterns that should be disregarded in the repository. This ensures a cleaner and more efficient workspace by excluding unnecessary items.

• Improvements to pygdsm/base_skymodel.py

  • The os module has been implemented to provide a way of using operating system dependent functionality.
  • The file existence check in the BaseSkyModel class has been made more robust. If a file is not found, the system will raise an error, thus avoiding crashes and unforeseen effects.
  • Certain unnecessary white spaces have been eliminated from the view and get_sky_temperature methods leading to a cleaner code.

• Addition of test_base_skymodel.py A new file designated tests/test_base_skymodel.py has been generated exclusively for testing the BaseSkyModel class. This will enable more thorough evaluation of the BaseSkyModel class's functionality.

• Enhancements to tests/test_gsm.py

  • Implementation of pytest and SkyCoord, providing testing tools and coordinate representations respectively.
  • A variety of new tests have been created:
  • test_compare_to_gsm measures the coherence between the Python and Fortran versions of the GSM to ensure consistent output.
  • test_get_sky_temperature provides a critical review of get_sky_temperature method from the GlobalSkyModel class.
  • test_stupid_values verifies the software's response to invalid input values ensuring the system handles such scenarios gracefully.
  • test_set_interpolation_method checks the functionality of the set_interpolation_method of GlobalSkyModel class to assure it’s working as expected.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 76.92308% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 94.90%. Comparing base (f830df7) to head (3556c58).

Files	Patch %	Lines
pygdsm/base_skymodel.py	76.92%	3 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #28 +/- ## ========================================== + Coverage 91.59% 94.90% +3.30% ========================================== Files 9 9 Lines 488 491 +3 ========================================== + Hits 447 466 +19 + Misses 41 25 -16 ```

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