feat(challenges): add acronyms

challenges/acronyms/test/1/input.txt

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+Programming Challenges is really cool

challenges/acronyms/test/1/output.txt

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+PCIRC

challenges/acronyms/test/2/input.txt

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+a whole sentence in lowercase

challenges/acronyms/test/2/output.txt

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+AWSIL

challenges/acronyms/test/3/input.txt

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+YOU CAN ALSO WRITE EVERYTHING IN CAPITALS

challenges/acronyms/test/3/output.txt

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+YCAWEIC

challenges/acronyms/test/4/input.txt

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+We CaN aLSO miX the tWo

challenges/acronyms/test/4/output.txt

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+WCAMTT

challenges/acronyms/test/5/input.txt

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+Hurry I have an appointment

challenges/acronyms/test/5/output.txt

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+HIHAA

challenges/acronyms/test/6/input.txt

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+The "quotes" will crash your code

challenges/acronyms/test/6/output.txt

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+TQWCYC