Power Function

[swallaB]

Type of change

• Added new functionality
• 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

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

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