Add new sections by GitbookIO editor is quite simple, but sometimes you may forget to add sections in SUMMARY.md.

It is easy to parse the title of source .md files and add it to the appropriate chapter position. I will implement this feature with Python.

It'll be good to add an introduction into the readme for the basic information of the repo, such as where are the problems coming from, how do you pick problems into this repo, etc.

For example , I have solved 38 problems in leetcode, 38 in python and 2 in javascript.
When set language to javascript, the solutions in Readme should display "2"

Add a parameter: num_solved_by_language, and change the count from num_solved to num_solved_by_language