Added task manager app

[mehul-m-prajapati]

Closes: #814

• Title: Task manager app
• Name: Mehul Prajapati
• Idenitfy yourself: GSSOC-EXT , Hacktoberfest

Describe the add-ons or changes you've made 📃

Screenshots 📷

Type of change ☑️

What sort of change have you made:

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Code style update (formatting, local variables)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist: ☑️

• My code follows the Contributing Guidelines & Code of Conduct of this project.
• This PR does not contain plagiarized content.
• I have performed a self-review of my own code.
• I have commented my code, particularly wherever it was hard to understand.
• My changes generate no new warnings.

Note to reviewers 📄

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[Avdhesh-Varshney]

Enlist your project in Angular projects readme file and convert ss png to webp

[mehul-m-prajapati]

Avdhesh-Varshney

@Avdhesh-Varshney : okay, done.

[mehul-m-prajapati]

Enlist your project in Angular projects readme file and convert ss png to webp

@Avdhesh-Varshney : please review and move ahead with this one.

[Avdhesh-Varshney]

Properly write your readme file

[mehul-m-prajapati]

@Avdhesh-Varshney : Fixed readme now. please review the same.