minor chages
added backend interview questions file
added linked list
iterative binary search added
recursive binary search added
added truthy and falsy realted question
added road map for my interview materials
added a file for DOM related question
moved dom related stuff to DOM question
added innherHTML
added dom ready
added dom ready
added todo questions
some more questions
added reflow and repaint
Merge pull request #16 from khan4019/master

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