Add ShapeFactory class to generate desired shapes using factory design pattern

[sweep-ai[bot]]

Description

This PR adds a new class named "ShapeFactory" to the Shapes.Library project. The ShapeFactory class implements the factory design pattern to generate desired shapes based on the input shape type.

Summary

• Created a new class named "ShapeFactory" in the Shapes.Library project.
• Added a static method "CreateShape" to the ShapeFactory class that takes a string parameter representing the desired shape type and returns an instance of the corresponding shape class.
• Implemented a switch statement inside the CreateShape method to handle different shape types and instantiate the corresponding shape class based on the input.
• Updated the README.md file to include instructions on how to use the ShapeFactory class to generate desired shapes.

Fixes #50.

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[obirler]

Use parameter array to create shapes with parameters