Add new topic: scapy

[joesinghh]

Please confirm this pull request meets the following requirements:

• I followed the contributing guidelines: https://github.com/github/explore/blob/master/CONTRIBUTING.md.
• I have no affiliation with the project I am suggesting (as a maintainer, creator, contractor, or employee).

Which change are you proposing?

• Suggesting edits to an existing topic or collection
• Curating a new topic or collection
• Something that does not neatly fit into the binary options above

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Editing an existing topic or collection

I'm suggesting these edits to an existing topic or collection:

• Image (and my file is *.png, square, dimensions 288x288, size <= 75 kB)
• Content (and my changes are in index.md)

Please replace this line with an explanation of why you think these changes should be made.

Curating a new topic or collection

• I've formatted my changes as a new folder directory, named for the topic or collection as it appears in the URL on GitHub (e.g. https://github.com/topics/scapy or https://github.com/collections/scapy)
• My folder contains a *.png image (if applicable) and index.md
• All required fields in my index.md conform to the Style Guide and API docs: https://github.com/github/explore/tree/master/docs

Scapy has become very popular and it's a powerful interactive packet manipulation program, that's why I think this topic should be curated.

Something that does not neatly fit into the binary options above

• My suggested edits are not about an existing topic or collection, or at least not a single one
• My suggested edits are not about curating a new topic or collection, or at least not a single one
• My suggested edits conform to the Style Guide and API docs: https://github.com/github/explore/tree/master/docs

Please replace this line with an explanation of your proposed changes.

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Please note: we will close your PR without comment if you do not check the boxes above and provide ALL requested information.

[guedou]

Some information provided in this PR are incorrect. I will try to provide feedback ASAP.

[joesinghh]

Some information provided in this PR are incorrect. I will try to provide feedback ASAP.

sure, let me know so I can fix them.

[guedou]

Could you apply these changes?

[joesinghh]

Could you apply these changes?

Thanks for reviewing them, I have now made the required changes.

[guedou]

It looks OK. Thanks!

[kenyonj]

💯 🍨 Thank you for your contribution! I'll merge this in as soon as CI is 🍏

(I'll make the suggested change)

[kenyonj]

Looks like there are still CI issues. Specifically:

topics::scapy topic#test_0019_has at most one image with the right name, type, and dimensions [/home/runner/work/explore/explore/test/topics_test.rb:229]:
topic images should be 288px wide.
Expected: 288
  Actual: 595

[joesinghh]

@kenyonj Thanks, I'll add a different image now.

[joesinghh]

@kenyonj can you merge it now :)
Thank you for reviewing.