add morse code snippet

[valterm]

Description

A script to translate strings into morse code

Fixes #31

Type of change

Choose one or more options from the following as per the nature of your Pull request.

• New feature (non-breaking change which adds functionality)

Checklist:

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• I have named my files and folder, according to this project's guidelines.
• My code follows the style guidelines of this project.
• My Pull Request has a descriptive title. (not a vague title like Update index.md)
• I have commented on my code, particularly in hard-to-understand areas.