Add Implementation for Sum of Geometric Progression

[SpiderMath]

Describe your change:

• Add an algorithm?
• Fix a bug or typo in an existing algorithm?
• Documentation change?

Checklist:

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• This pull request is all my own work -- I have not plagiarized.
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• This PR only changes one algorithm file. To ease review, please open separate PRs for separate algorithms.
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I added the implementation for Sum of GP

[SpiderMath]

Just a question, I've made it so that if someone inputs Infinity as the number of terms in the algorithm, and the magnitude of common ratio is more than or equal to 1, I throw an Error since the series is divergent.
Is that okay? Or do I just return Infinity as the response (because that could be a possible response 🤷 )