Add JavaScript and TypeScript code of permutations and n_queens (Chapter of Backtracking) (#494)
* Add JavaScript and TypeScript code of permutations and n_queens (Chapter of Backtracking)
* Update n_queens.js
* Update permutations_i.js
* Update permutations_ii.js
* Update n_queens.ts
* Update permutations_i.ts
* Update permutations_ii.ts
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Co-authored-by: Yudong Jin <krahets@163.com>
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