More readable version of Kadane's algorithm in Java

[Prabodhan29]

💥 Proposal

(A clear and concise description of what the proposal is.)

Have you read the Contributing Guidelines on Pull Requests?

Yes I have read the contributing guidelines.

(Write your answer here.) The Kadane's algorithm is already present in the algorithms folder under Java. I have improved the code readability and also commented how the input and output should look like. The problem statement was also missing in the existing file.

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