Add some videos about V8 and libuv

[okmttdhr]

Added some video links so that awesome-nodejs can be effective for understanding Node.js internals.

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By submitting this pull request, I promise I have read the contribution guidelines twice and ensured my submission follows it. I realize not doing so wastes the maintainers' time that they could have spent making the world better. 🖖

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[sindresorhus]

Have you actually watched these videos and can confirm that they're useful and of high quality (content-wise)?

[okmttdhr]

@sindresorhus Yes I've watched all the videos and, in my opinion, these were great resources compared to other videos!

• Google I/O videos by SWEs at Google
  • The videos from 2009 and 2012 are a bit old in some areas, but they are very useful for understanding the basics of V8, like Inline Caching, Hidden Class, and Bailout.
  • The video from 2013 will help you when optimizing your application performance with V8 knowledge.
• Node JS Internal Architecture
  • I've watched other videos about libuv or V8, but this video is the one that gives clear and correct information about both.
• Introduction to libuv by libuv maintainer, libuv Cross platform asynchronous i/o by libuv core contributor
  • Here is a video about libuv with source code and correct information about thread pool.
• You Don't Know Node
  • This video will give you a niche but important knowledge about Node.js.