Add js_behind_the_scenes.md

PB Sweep · PB Sweep · commit 8f1d39664a1b · 2023-11-08T15:37:43.000Z
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+# JavaScript - Behind the scenes
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+Non-blocking event loop: JavaScript runs in a single thread. For non-blocking behaviour, it uses an event loop, i.e. it takes long running tasks, executes them in the "background", and puts them back in the main thread once finished. 
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 +# JavaScript - Behind the scenes
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 +Non-blocking event loop: JavaScript runs in a single thread. For non-blocking behaviour, it uses an event loop, i.e. it takes long running tasks, executes them in the "background", and puts them back in the main thread once finished.
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