Add TabTime Guardian browser extension for time management

[tanushrigoel]

Closes: #799

• Title: TabTime Guardian
• Name: Tanushri Goel
• Idenitfy yourself: GSSOC Hacktoberfest contributor

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

I have added a vanilla JS project. It is basically a browser extension that help people manage their productivity.

Screenshots 📷

Type of change ☑️

What sort of change have you made:

• New feature (non-breaking change which adds functionality)
• 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.

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[tanushrigoel]

Please add hacktoberfest, gssoc and level labels on the PR

[tanushrigoel]

@Avdhesh-Varshney can you please elaborate on the bug i need to fix.

[Avdhesh-Varshney]

Read guidelines carefully here and match these guidelines with the present projects ok.