feat: added generate random number functionality

[bhattabhi013]

Related Issue

• Information about the related issue

Closes: #51

Describe the changes you've made

Added functionality to generate random number between 1-1000.

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?

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.

Screenshots (if applicable)

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Name	Status	Preview	Updated
all-round-calculator	✅ Ready (Inspect)	Visit Preview	Oct 16, 2022 at 4:47PM (UTC)

[Susmita-Dey]

LGTM.