Added Greetings bot

[himanshu007-creator]

Related Issue

• GREETINGS BOT 🤖 #35

Closes: #35

Describe the changes you've made

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Describe if there is any unusual behaviour of your code(Write NA if there isn't)

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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.
• New and existing unit tests pass locally with my changes.

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[himanshu007-creator]

please add DWOCand LEVEL-5 tags and assign me.