Added Count Number of Vowel Strings in Range Problem[Leetcode]

L-B/0020 Count Number of Vowel Strings in Range/CountNumberOfVowelStringsInRange.js

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+/**
+ * @param {string[]} words
+ * @param {number} left
+ * @param {number} right
+ * @return {number}
+ */
+const isVowel = (c) => {
+    if(c === 'a' || c === 'e' || c === 'i' || c === 'o' || c === 'u') return true;
+    return false;
+}
+
+var vowelStrings = function(words, left, right) {
+    let ans = 0;
+    for(let i = left; i <= right; i++) {
+      let s = words[i];
+      if(isVowel(s[0]) && isVowel(s[s.length - 1])) ans++;
+    }
+    return ans;
+}

L-B/0020 Count Number of Vowel Strings in Range/README.md

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+#0020 Count Number of Vowel Strings in Range (L-B)
+
+## Problem
+You are given a 0-indexed array of string words and two integers left and right.
+
+A string is called a vowel string if it starts with a vowel character and ends with a vowel character where vowel characters are 'a', 'e', 'i', 'o', and 'u'.
+
+Return the number of vowel strings words[i] where i belongs to the inclusive range [left, right].
+
+## Test Cases
+- Example 1:
+    INPUT:- words = ["are","amy","u"], left = 0, right = 2  
+    OUTPUT:- 2
+
+- Example 2:
+    INPUT:- words = ["hey","aeo","mu","ooo","artro"], left = 1, right = 4
+    OUTPUT:- 3
+
+## Reference Link
+- [Leetcode](https://leetcode.com/problems/count-the-number-of-vowel-strings-in-range/)
+
+## Problem Added By
+- [Github] (https://github.com/Sayak04)