Add Base64 Encode Decode in Bash

[rzuckerm]

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I Am Adding a New Code Snippet in an Existing Language

• I fixed Add Base64 Encode Decode in Bash #4589
• I did not include any extra folders/libraries
• I named the pull request using Add {PROJECT} in {LANGUAGE} format

[Kaamkiya]

Yikes, that's a lot of bash! Nice accomplishment though :)