Prepare for 0.1.0

[azeey]

🎈 Release

Preparation for 0.1.0 release.

• Keep version information in one place (src/sdformat_mjcf/__version__.py)
• Add PyPI classifiers
• Use name of license instead of content (that's what all the packages I've looked at do)

Checklist

• [ ] Asked team if this is a good time for a release
• [ ] There are no changes to be ported from the previous major version
• [ ] No PRs targeted at this major version are close to getting in
• [ ] Bumped minor for new features, patch for bug fixes
• [ ] Updated changelog
• [ ] Updated migration guide (as needed)
• [ ] Link to PR updating dependency versions in appropriate repository in ignition-release (as needed):

Note to maintainers: Remember to use Squash-Merge and edit the commit message to match the pull request summary while retaining Signed-off-by messages.

[codecov[bot]]

Codecov Report

Merging #102 (4583f3a) into main (757065c) will increase coverage by 0.08%. The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main     #102      +/-   ##
==========================================
+ Coverage   95.12%   95.20%   +0.08%     
==========================================
  Files          24       24              
  Lines        1169     1168       -1     
==========================================
  Hits         1112     1112              
+ Misses         57       56       -1     

Impacted Files	Coverage Δ
sdformat_mjcf/src/sdformat_mjcf/__version__.py	0.00% <0.00%> (ø)

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