add JS function to calculate average of numbers

[victoriacheng15]

Why:

Closes #743

What's being changed:

Added JavaScript function to calculate the average of numbers

Check off the following:

• I have reviewed my changes in staging (look for "Automatically generated comment" and click Modified to view your latest changes).
• For content changes, I have completed the self-review checklist.

[github-actions]

👋 Hey @victoriacheng15

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            |  👋 Hey victoriacheng15                         
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            |  💖 Thanks for opening this Pull Request 💖   |
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   _/*\_    |  This PR will be reviewed and merged shortly  |
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  |_| |_|                        - Scott Hanselman
  

[harshraj8843]

👍🏻

[github-actions]

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