Added youtube-dl notes to the knowledge base

knowledge base/youtube-dl.md

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+# Youtube-DL
+
+## TL;DR
+
+```shell
+# limit the bandwidth
+youtube-dl --format 313 --limit-rate 2M $URL
+
+# list all available formats
+youtube-dl --list-formats ${URL}
+
+# download bestvideo and bestaudio formats and merge them in a single file
+youtube-dl -f bestvideo+bestaudio $URL
+
+# download formats separately and do not merge them
+youtube-dl -f bestvideo,bestaudio $URL
+
+# download the best all-around formats
+youtube-dl -f best $URL
+
+# also download thumbnails and other info (in separate files)
+youtube-dl --write-description --write-info-json --write-annotations --write-sub --write-thumbnail $URL
+
+# sequentially download a list of videos
+parallel --jobs 1 --retries 10 'youtube-dl -f bestvideo+bestaudio "https://www.youtube.com/watch?v={}"' ::: ${CODES[@]}
+```
+
+## Installation
+
+The preferred method is to just download it from the [project]:
+
+```shell
+curl --location https://yt-dl.org/downloads/latest/youtube-dl --remote-name
+chown a+x youtube-dl
+python3 youtube-dl …
+```
+
+Alternatively, most package managers will have the package available.
+
+## Further readings
+
+- Github [project]'s page
+- [Website]
+- [Youtube-DL tutorial with examples for beginners]
+
+[project]: https://github.com/ytdl-org/youtube-dl
+[website]: http://ytdl-org.gitlab.io/youtube-dl
+
+[youtube-dl tutorial with examples for beginners]: https://ostechnix.com/youtube-dl-tutorial-with-examples-for-beginners