[oxygen] Add new extractor

[StevenDTX]

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• At least skimmed through adding new extractor tutorial and youtube-dl coding conventions sections
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What is the purpose of your pull request?

• Bug fix
• Improvement
• New extractor
• New feature

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Description of your pull request and other information

New site request for Oxygen.

[dstftw]

No copy-pasting here.

[StevenDTX]

No copy-pasting here.

Can you please provide a bit of explanation? The Bravo and Oxygen websites are identical, and with only slight modification, the Bravo extractor works for Oxygen.

Thanks.

[dstftw]

Explanation on what? You are not allowed to copy paste code.

[wattsra]

Will this be merged? it works perfectly

EDIT: I removed the previous message as I was running on my sys install version of youtube-dl - DOH!