Precommit fixes and basic readme

[sfmig]

Description

What is this PR

• Bug fix
• Addition of a new feature
• Other

Why is this PR needed?
Installation of the package from source as described in the README was failing due to a typo in the tags.

What does this PR do?

• The typo in the tags has been fixed and the pre-commits applied (so the tests now pass).
• I added a simple README specifying installation instructions.

References

#2

How has this PR been tested?

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Is this a breaking change?

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Does this PR require an update to the documentation?

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Checklist:

• The code has been tested locally
• [ n/a ] Tests have been added to cover all new functionality
• [ n/a ] The documentation has been updated to reflect any changes
• The code has been formatted with pre-commit