included CMakeLists.txt

[cringeyburger]

Description

Current source distributions do not have the CMakelists.txt shipped in them, so the users cannot build it.
Fixed by adding CMakeLists.txt in Manifest.in

Fixes # (issue)

Type of change

Please add a line in the relevant section of CHANGELOG.md to document the change (include PR #) - note reverse order of PR #s. If necessary, also add to the list of breaking changes.

• New feature (non-breaking change which adds functionality)
• Optimization (back-end change that speeds up the code)
• Bug fix (non-breaking change which fixes an issue)

Key checklist:

• No style issues: $ pre-commit run (or $ nox -s pre-commit) (see CONTRIBUTING.md for how to set this up to run automatically when committing locally, in just two lines of code)
• All tests pass: $ python run-tests.py --all (or $ nox -s tests)
• The documentation builds: $ python run-tests.py --doctest (or $ nox -s doctests)

You can run integration tests, unit tests, and doctests together at once, using $ python run-tests.py --quick (or $ nox -s quick).

Further checks:

• Code is commented, particularly in hard-to-understand areas
• Tests added that prove fix is effective or that feature works

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.54%. Comparing base (becb1a4) to head (20e1be6).
Report is 215 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #4101      +/-   ##
===========================================
- Coverage    99.56%   99.54%   -0.02%     
===========================================
  Files          287      287              
  Lines        21744    21744              
===========================================
- Hits         21649    21646       -3     
- Misses          95       98       +3     

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[agriyakhetarpal]

Thanks for the fix, @cringeyburger!