Add anyone-with-the-link example

[manumonti]

Type of PR:

• [ ] Bugfix
• [x] Feature
• [ ] Documentation
• [ ] Other

Required reviews:

• [ ] 1
• [X] 2
• [ ] 3

What this does: This is a draft for an example about anyone-with-the-link-can-decrypt use case.

Issues fixed/closed:

• Fixes #...

Why it's needed:

Explain how this PR fits in the greater context of the NuCypher Network. E.g., if this PR address a nucypher/productdev issue, let reviewers know!

Notes for reviewers:

What should reviewers focus on? Is there a particular commit/function/section of your PR that requires more attention from reviewers?

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