Add site-support for Zpravy Seznam.cz (CZech news site)

[breznak]

Please follow the guide below

• You will be asked some questions and requested to provide some information, please read them carefully and answer honestly
• Put an x into all the boxes [ ] relevant to your issue (like this: [x])
• Use the Preview tab to see what your issue will actually look like

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Make sure you are using the latest version: run youtube-dl --version and ensure your version is 2017.09.02. If it's not, read this FAQ entry and update. Issues with outdated version will be rejected.

• I've verified and I assure that I'm running youtube-dl 2017.09.02

Before submitting an issue make sure you have:

• At least skimmed through the README, most notably the FAQ and BUGS sections
• Searched the bugtracker for similar issues including closed ones

What is the purpose of your issue?

• Site support request (request for adding support for a new site)

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The following sections concretize particular purposed issues, you can erase any section (the

The example single video URL is:
https://www.seznam.cz/zpravy/clanek/jejich-svet-na-nas-utoci-je-lepsi-branit-se-na-jejich-pisecku-rika-reziser-a-major-v-zaloze-marhoul-35990

The pattern is:
https://www.seznam.cz/zpravy/clanek/some-words-with-dashes-NNNN

Thank you,

[lki2019]

https://v39-a.sdn.szn.cz/v_39/vmd_5999c902ea707c67d8e267a9/1503250723?fl=mdk,432f65a0|hlsp2,h264_aac_1080p_ts,3,VOD