Added JavaScript solution for Mini Parser

[Sufiyan-MSA]

Added JavaScript solution for 385. Mini Parser with problem statement, time and space complexity.

[github-actions]

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[Sufiyan-MSA]

Hi!

I’ve contributed over 18 times to this repo across different folders, including Java and Python. I noticed there were fewer JavaScript solutions, so I added there as well. I’ve been contributing actively and have followed the contribution guidelines carefully.

The solutions are verified on LeetCode by me and includes the problem statement, time and space complexity analysis, and sample input/output example.

If everything looks good, please consider merging it and adding the Hacktoberfest-accepted label as it'll end within few hours. I’d really appreciate it and it would mean a lot to me.

Thanks!