Added splash/preloader screen (#366)

* Added splash screen

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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* Added splash screen to Main.js

* Chore: Variable names updated as per review requested

* Updated as per review comment

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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* Fix potential bug in conditional

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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Co-authored-by: Ashutosh Sharma <ashutosh@thefastway.in>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Ashutosh Sharma <raidzenash@gmail.com>
Co-authored-by: Kartik Choudhary <chow.kartik@gmail.com>