Repository: youtube-dl
Issue: Support for https://n.news.naver.com/mnews/article(+ and willing to contribute to this)
Labels: site-support-request

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## Checklist

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Carefully read and work through this check list in order to prevent the most common mistakes and misuse of youtube-dl:
- First of, make sure you are using the latest version of youtube-dl. Run `youtube-dl --version` and ensure your version is 2021.12.17. If it's not, see https://yt-dl.org/update on how to update. Issues with outdated version will be REJECTED.
- Make sure that all provided video/audio/playlist URLs (if any) are alive and playable in a browser.
- Make sure that site you are requesting is not dedicated to copyright infringement, see https://yt-dl.org/copyright-infringement. youtube-dl does not support such sites. In order for site support request to be accepted all provided example URLs should not violate any copyrights.
- Search the bugtracker for similar site support requests: http://yt-dl.org/search-issues. DO NOT post duplicates.
- Finally, put x into all relevant boxes (like this [x])
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- [x] I'm reporting a new site support request
- [x] I've verified that I'm running youtube-dl version **2021.12.17**
- [x] I've checked that all provided URLs are alive and playable in a browser
- [x] I've checked that none of provided URLs violate any copyrights
- [x] I've searched the bugtracker for similar site support requests including closed ones


## Example URLs

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Provide all kinds of example URLs support for which should be included. Replace following example URLs by yours.
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- Single video: https://n.news.naver.com/mnews/article/052/0001813167?sid=291
- Single video: https://n.news.naver.com/mnews/article/374/0000310300


## Description
```
C:\Users\jinhere>youtube-dl -v -F https://n.news.naver.com/mnews/article/052/0001813167?sid=291
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-v', '-F', 'https://n.news.naver.com/mnews/article/052/0001813167?sid=291']
[debug] Encodings: locale cp949, fs utf-8, out utf-8, pref cp949
[debug] youtube-dl version 2021.12.17
[debug] Python version 3.10.4 (CPython) - Windows-10-10.0.19044-SP0
[debug] exe versions: none
[debug] Proxy map: {}
[generic] 0001813167?sid=291: Requesting header
WARNING: Falling back on generic information extractor.
[generic] 0001813167?sid=291: Downloading webpage
[generic] 0001813167?sid=291: Extracting information
ERROR: Unsupported URL: https://n.news.naver.com/mnews/article/052/0001813167?sid=291
Traceback (most recent call last):
  File "C:\Users\jinhere\AppData\Local\Programs\Python\Python310\lib\site-packages\youtube_dl\YoutubeDL.py", line 815, in wrapper
    return func(self, *args, **kwargs)
  File "C:\Users\jinhere\AppData\Local\Programs\Python\Python310\lib\site-packages\youtube_dl\YoutubeDL.py", line 836, in __extract_info
    ie_result = ie.extract(url)
  File "C:\Users\jinhere\AppData\Local\Programs\Python\Python310\lib\site-packages\youtube_dl\extractor\common.py", line 534, in extract
    ie_result = self._real_extract(url)
  File "C:\Users\jinhere\AppData\Local\Programs\Python\Python310\lib\site-packages\youtube_dl\extractor\generic.py", line 3489, in _real_extract
    raise UnsupportedError(url)
youtube_dl.utils.UnsupportedError: Unsupported URL: https://n.news.naver.com/mnews/article/052/0001813167?sid=291
```
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Hello, the website i want support is 'naver news' which has a video and news letters at a single page. I ran the command and it says it is unsupported url. So i thought it could be solved by adding new extractor, but I've found there is an extractor called naver.py that extracts video from 'naver tv'(the video player looked similar). So my question is: do i have to make a new extractor or add codes in naver.py?
I might be asking obvious question but this is my first time reading&contributing to big project so i want to ask you before starting.