Add documentation about running DataFed Python package from source repo

[JoshuaSBrown]

Summary by Sourcery

Documentation:

• Add documentation on how to run the DataFed Python package from the source repository.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request adds documentation to explain how to run the DataFed Python package from the source repository. The changes are straightforward documentation updates with no code modifications.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Added documentation for running DataFed Python package from source	Added instructions for running the package from source repository	python/datafed_pkg/README

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[sourcery-ai]

Hey @JoshuaSBrown - I've reviewed your changes - here's some feedback:

Overall Comments:

• The pull request appears to be empty - please include the actual documentation changes you're proposing to add.

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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