Power Function

[swallaB]

Type of change

• [x] Added new functionality
• [x] Enhanced documentation

Changes proposed in this pull request

• Project name : Calculator

• Short description : i have added a new function called power which calculates and returns the power(positive) of a number

Checklist

• [x] The code is Python 3 compatible
• [x] I have added relevant comments in my file to make code understandable
• [x] I have added my project in a folder which includes all the necessary files

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