[Term Entry] Python NumPy - ndarray: cumsum()

[michalszkil]

Description

Added documentation for cumsum() term in content/numpy/concepts/ndarray/terms/cumsum/cumsum.md with examples.

Issue Solved

Closes #7861

Type of Change

• Adding a new entry

Checklist

• All writings are my own.
• My entry follows the Codecademy Docs style guide.
• My changes generate no new warnings.
• I have performed a self-review of my own writing and code.
• I have checked my entry and corrected any misspellings.
• I have made corresponding changes to the documentation if needed.
• I have confirmed my changes are not being pushed from my forked main branch.
• I have confirmed that I'm pushing from a new branch named after the changes I'm making.
• I have linked any issues that are relevant to this PR in the Issues Solved section.

[CLAassistant]

All committers have signed the CLA.

[mamtawardhani]

Looks good for a second review! 🚀

[Radhika-okhade]

The entry looks good to be merged.

[github-actions]

👋 @michalszkil
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