create HYSPEC intensity matrix

[KyleQianliMa]

Short description of the changes:

Long description of the changes:

Check list for the pull request

• I have read the [CONTRIBUTING]
• I have read the [CODE_OF_CONDUCT]
• I have added tests for my changes
• I have updated the documentation accordingly

Check list for the reviewer

• I have read the [CONTRIBUTING]
• I have verified the proposed changes
• best software practices
  • all internal functions have an underbar, as is python standard
  • clearly named variables (better to be verbose in variable names)
  • code comments explaining the intent of code blocks
• All the tests are passing
• The documentation is up to date
• code comments added when explaining intent

Manual test for the reviewer

References

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.36%. Comparing base (f7b5f76) to head (6e8f5b3).

Additional details and impacted files

@@            Coverage Diff             @@
##             next      #24      +/-   ##
==========================================
+ Coverage   92.90%   98.36%   +5.45%     
==========================================
  Files          10       10              
  Lines         747      732      -15     
==========================================
+ Hits          694      720      +26     
+ Misses         53       12      -41     

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[AndreiSavici]

Looks reasonable