chore: added message for successful initialization

[gunjjoshi]

Added a success message in the Makefile, which shows up on successful initialization

Resolves #1400

Description

What is the purpose of this pull request?

This pull request:

• adds "Initialization Successful." message after successful execution of make init.

Related Issues

Does this pull request have any related issues?

This pull request:

• resolves Missing Success Message Upon Initialization Completion #1400

Questions

Any questions for reviewers of this pull request?

No.

Other

Any other information relevant to this pull request? This may include screenshots, references, and/or implementation notes.

Although a small task, but still it can give clarity to new contributors.

Checklist

Please ensure the following tasks are completed before submitting this pull request.

• [ ☑️] Read, understood, and followed the contributing guidelines.

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@stdlib-js/reviewers

[Planeshifter]

That should work; thanks for adding!