Department store bill generation in Java

[Pratikshaekbote]

Code contribution

• [ ] Read through contributing.md
• [x] All the code files are in a relevant directory
• [ ] Code is only in java (and the files have .java extension), no other files (e.g. .class files) are included
• [x] The code is not already present in the repository
• [x] The contribution is meaninful and not just a simple print statement
• [x] The build passes for your PR

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ReadMe contribution

• [ ] Formatting is good and not messy
• [ ] The PR has meaninful contribution to make the repository better and not just typos or such small changes

[Pradyuman7]

Thanks for contributing, can you please make sure to include only the files necessary for running the code, i.e. compiled classes or binaries are not really needed

[Pradyuman7]

Since hacktoberfest is over now, I am closing this PR, but feel free to reopen if you'd like to work on it