Add NASA certification process

[iramosp]

This PR adds a file explaining the NASA certification process to the Nebula cohort processes and procedures folder.

• Tagging @doaamkader for content review: Are the steps clear? Any questions we should anticipate?
• Tagging @NPDebs for technical review after content approval.

👍🎉 First of all, thanks for taking the time to contribute! 🎉👍

FOR CONTRIBUTOR

• I have read the CONTRIBUTING.md document

PR Type:

• This PR adds a new blog post
• This PR does something else (explain above)

FOR REVIEWERS

Thanks for taking the time to review! ❤️

Here are the list of things to make sure of:

• The website builds (a check will fail if not)
• All images have been added within the Pull Request and they have Alt text
• If there are paragraphs or text, the key messages are highlighted
• All internal links (within OLS website) use the {% link path_to_file.md %} format
• The preview corresponds to the changes described in the Pull Request
• The code is tidy and passes the linting tests

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[NPDebs]

Thanks, Irene! 🌟

@doaamkader - Here's a preview of the changes made.

[NPDebs]

Suggested change

	2. **Create and log into an account on https://openscience101.org/.***
	2. **Create and log into an account on [openscience101.org](https://openscience101.org/).**