Feature/instructions for opening napari as an administrator in readme

[schoinh]

Closes #120

Pull request recommendations:

• [x] Name your pull request your-development-type/short-description. Ex: feature/read-tiff-files
• [x] Link to any relevant issue in the PR description. Ex: Resolves [gh-12], adds tiff file format support
• [ ] Provide context of changes.
• [ ] Provide relevant tests for your feature or bug fix.
• [x] Provide or update documentation for any feature added by your pull request.

Thanks for contributing!

[codecov[bot]]

Codecov Report

Merging #121 (a3feaa5) into main (da0d4a0) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #121   +/-   ##
=======================================
  Coverage   84.63%   84.63%           
=======================================
  Files          34       34           
  Lines        1425     1425           
=======================================
  Hits         1206     1206           
  Misses        219      219           

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