Added BMI Calculator Java Project

[kamalanathancv]

This PR adds a simple BMI calculator built with Java.
It uses console input to calculate and categorize BMI.
It is my first Open-source contribution project.

[github-actions]

👋 @kamalanathancv
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[iamwatchdogs]

Hi @kamalanathancv, it seems like the linting checks have failed. Please format your source code to pass the linting checks. You can refer to the timestamped YouTube video to find the formatting issue within your source code.

If you're still unable to fix the formatting issues, then you can check out the results of need-help workflow. You can find a sample version of your source code, which is formatted. Just open the need-help workflow and then open the logs of show diffs and exit.

If you're facing any issue or not sure what exactly to do, please feel free to ping me within this conversation.

[iamwatchdogs]

If the PR pass the linting check, I'll perform a code review and then merge the PR if everything looks good.