add method to calculate power of a number

[ays14]

Related Issue

Closes: #50

Describe the changes you've made

• Added a method doPower which accepts two arguments: base and exponent and then returns the value of base ^ exponent

Type of change

What sort of change have you made:

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Code style update (formatting, local variables)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

• By running a few test cases on local

Checklist

• My code follows the guidelines of this project.
• I have performed a self-review of my own code.
• I have commented on my code, particularly wherever it was hard to understand.
• I have made corresponding changes to the documentation.
• My changes generate no new warnings.
• I have added tests that prove my fix is effective or that my feature works.
• Any dependent changes have been merged and published in downstream modules.

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Name	Status	Preview	Updated
all-round-calculator	✅ Ready (Inspect)	Visit Preview	Oct 19, 2022 at 6:50PM (UTC)

[github-actions]

Our team will soon review your PR. Thanks :)

[Susmita-Dey]

Thanks for adding the documentation along with the code.

Good job.

[Susmita-Dey]

@ays14 There's some merge conflicts. Kindly fix it then I'll merge it.

[ays14]

@ays14 There's some merge conflicts. Kindly fix it then I'll merge it.

Hi @Susmita-Dey , resolved the conflicts, please check.

[its-abhirup]

LGTM

[Susmita-Dey]

Great job!