update README to mention new SED set #55

[sschmidt23]

Just an update to the README file that mentions the COSMOS SEDs now included in rail_base

Code Quality

• My code follows the code style of this project
• I have written unit tests or justified all instances of #pragma: no cover; in the case of a bugfix, a new test that breaks as a result of the bug has been added
• My code contains relevant comments and necessary documentation for future maintainers; the change is reflected in applicable demos/tutorials (with output cleared!) and added/updated docstrings use the NumPy docstring format
• Any breaking changes, described above, are accompanied by backwards compatibility and deprecation warnings

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (deefe81) to head (c655980).
Report is 3 commits behind head on main.

Additional details and impacted files

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##              main       #56   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files            3         3           
  Lines          242       242           
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  Hits           242       242           

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