Basic workflow for model creation.

[muskan191103]

Description

When a beginner starts to learn about Machine Learning, they might get little confuse in understanding the basic workflow of creating a model, parameter tuning and then saving it.

Fixes # (issue #399 )

Type of change

• [ ] Added a new machine learning frameworks, libraries or software.
• [✅] Documentation update

Checklist:

• [✅] My code follows the style guidelines of this project
• [✅] I have performed a self-review of my own code
• [✅] I have commented my code, particularly in hard-to-understand areas
• [✅] I have made corresponding changes to the documentation
• [✅] My changes generate no new warnings

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