New feature: document other CLI related resources

[lirantal]

Document other resources like:

1. https://clig.dev/
2. https://primer.style/cli/getting-started/principles

as additional educational material

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Expected scope of work for this issue:

• The README currently has 8 sections
• Let's add a new section called: 10 Appendix: CLI educational resources
• In it, let's document the above suggested resources
• Let's not do the other section's format of "DO and OTHERWISE" because it doesn't fit. Instead, should we use a table to document them with some other properties, or perhaps just a bulleted list? Happy to go with whatever makes the most sense and we can change later.

[S0han]

can you further explain exactly what needs to be done for this issue?

[lirantal]

I updated the description for the work on this issue.
Thanks for chiming in here too @S0han.

[MichalPorag]

@lirantal Can I take it?

[lirantal]

Please do 👍🏽

[lirantal]

Fixed in #91