Add slstr

[TAlonglong]

• [ ] Closes #81
• [ ] Tests added
• [ ] Tests passed
• [ ] Passes flake8 pyorbital
• [ ] Fully documented

[codecov[bot]]

Codecov Report

Merging #98 (e8e2e26) into main (26e857b) will increase coverage by 0.03%. The diff coverage is 90.47%.

@@            Coverage Diff             @@
##             main      #98      +/-   ##
==========================================
+ Coverage   86.86%   86.89%   +0.03%     
==========================================
  Files          13       13              
  Lines        2048     2068      +20     
==========================================
+ Hits         1779     1797      +18     
- Misses        269      271       +2     

Flag	Coverage Δ
unittests	86.89% <90.47%> (+0.03%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pyorbital/geoloc_instrument_definitions.py	72.61% <85.71%> (+1.28%)	:arrow_up:
pyorbital/tests/test_geoloc.py	94.64% <100.00%> (+0.30%)	:arrow_up:

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[TAlonglong]

Could someone add appropriate tags to this issue? And who can review this?

[TAlonglong]

This PR is needed before issue 69 in pytroll-schedule can reviewed.

[adybbroe]

@TAlonglong Do you have time looking at this again, see comments above?