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Describe your change:

• Add an algorithm?
  Added SubsetSum algorithm and its tests in Recursive Alogrithms.

/** *@function subsetSum *@description This function recursively calculates the count of subsets whose sum equals the given target sum. *@param {number[]} arr - The input array of numbers. *@param {number} sum - The target sum we want to find in the subsets. *@param {number} ind - The current index. *@return {number} The count of subsets whose sum equals the target sum. * */exportfunctionsubsetSum(arr,sum,ind=0){//input validation only in the inital callif(ind===0&&(!Array.isArray(arr)||!arr.every((elem)=>typeofelem==='number'))){thrownewTypeError('arr should be an array of numbers')}if(ind===0&&typeofsum!=='number'){thrownewTypeError('sum should be a number')}if(ind===arr.length){returnsum===0 ?1 :0}returnsubsetSum(arr,sum,ind+1)+subsetSum(arr,sum-arr[ind],ind+1)}

Checklist:

• I have readCONTRIBUTING.md.
• This pull request is all my own work -- I have not plagiarized.
• I know that pull requests will not be merged if they fail the automated tests.
• This PR only changes one algorithm file. To ease review, please open separate PRs for separate algorithms.
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