Adds Infectious Disease Precautions to health protocols

[speco29]

Adding a simple guide to ensure health safety regarding diseases that can be contagious

[speco29]

Hi @speco29! Thanks for your contribution. This is much-needed content. Could you please use the emoji classification described here to categorize the ease of implementation and level of impact of each measure? https://discover-cookbook.numfocus.org/intro.html#how-to-use-this-cookbook

Thank you for the review @rivaquiroga! I have updated the file, please review it and let me know:)

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