added gotham theme (ref: #25)

[sreyan-ghosh]

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SOLVES ISSUE #25 partially.

Changes Made

1. File modified = styles/theme.ts
2. Added params for gotham theme taking hex values from other repos like github-readme-stats. Here is the inspiration.

SCREENSHOTS
I have personally used this in my own README.md. Here is a preview of it in development.

NOTE
Please consider this PR as a submission towards Hacktoberfest 2021 and add the hacktoberfest-accepted label.

[Kshitij978]

@sreyan-ghosh Please remove the package-lock.json from the commit and add a screenshot of your theme in svg format to THEMES.md

[sreyan-ghosh]

okay, i'll let you know when i am done with that

EDIT: Instead of reverting the file back, I added another commit that changed the value back to what it was pre-commit 1.

[sreyan-ghosh]

Hi @Kshitij978, I have done what had been asked. Cheers. 😃

[Ashutosh00710]

@sreyan-ghosh your theme is now available in production 🚀