added coincap API to fetch bitcoin price

[vishalkr058]

Description

I used coincap API to fetch the latest price of Bitcoin in usd currency

Screenshot

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Checklist

• [x] API used in this PR was not used in Random-APIs before.
• [x] API used in this PR is Public or I have permission to use it.
• [x] My contribution is working.
• [x] My changes don't generate any new warnings.
• [x] My changes don't affect any work done by other developers.

To tick a box, replace [ ] with [x].