square root exercise added

[TheRealOwenRees]

Square root exercises added

package-lock.json added to template directory as this should be copied when creating a new exercise too

[github-actions]

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[github-actions]

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[github-actions]

This is an unmaintained repository.

Cross-track maintainers - feel free to merge.

[TheRealOwenRees]

above comments have commits added already. I think they just weren't visible until the PR was reopened

[IsaacG]

above comments have commits added already. I think they just weren't visible until the PR was reopened

Yeah. Github doesn't let you update closed PRs by pushing commits.