feat add devcontainer for codespaces

[Ameya02]

Related Issue

Closes: #127

Describe the changes you've made

Add Devcontainer,json that will automatically configured the repo in the codespaces

Type of change

What sort of change have you made:

• [] Bug fix (non-breaking change which fixes an issue)
• [X] 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

How Has This Been Tested?

Describe how have you verified the changes made

Checklist:

• [X ] My code follows the guidelines of this project.
• [X] I have performed a self-review of my own code.
• [ ] I have commented my code, particularly wherever it was hard to understand.
• [ ] I have made corresponding changes to the documentation.
• [ ] My changes generate no new warnings.
• [ ] I have added tests that prove my fix is effective or that my feature works.
• [ ] Any dependent changes have been merged and published in downstream modules.

Screenshots

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[Ameya02]

Add Hacktoberfest label

[Ameya02]

@Utkarshn10 can u review it

[Utkarshn10]

Thanks @Ameya02 for contributing to Focusly. Do star the project to support it :)

[Utkarshn10]

@Utkarshn10 you have not added hacktoberfest label in your repo please add it

I have added the tags in the PR and also in repo.

[Ameya02]

Yeah Sorry about that the issue is solved now, its showing the PR