Add word hostel

[nik132-eng]

Add all the definitions of [Word] in a file named [Word].json in folder [First-Letter]

Refer CONTRIBUTING.md for more details on how to contribute.

Comment the words you'll be adding if you're are working on this issue to avoid conflicts.
Add reference to this issue i.e Issue # in your pull request description.

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[shreya-gb]

Hello, @nik132-eng I'm interested to work on this issue :)

Word to be added: "Hostel"