Add an intermediate (repeate str n times) problem

Author: ibr5500

L-I/0006 Repeat a String (L-I)/.gitignore

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+node_modules

L-I/0006 Repeat a String (L-I)/README.md

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+# 0006 Repate a String Num times
+
+repeat  a given string `str` for `num` of times, and return empty in case the num is zero or negative number. 
+
+#### Note: you are not allowd to use `.repeat()` method.
+
+## Test case:
+
+- Input: 'abc', 3 => Output: 'abcabcabc'
+- Input: 'abc', 0 => Output: ''
+- Input: 'abc', -2 => Output: ''
+
+## Solution:
+
+>- JavaScript.
+
+```
+const repeatStringNumTimes = (str, num) => {
+  if (num < 1) {
+    return "";
+  }
+  // here I used recursion technique to solve the problem
+  return str + repeatStringNumTimes(str, num - 1);
+};
+```
+
+>- [click](https://www.khanacademy.org/computing/computer-science/algorithms/recursive-algorithms/a/recursion) To lern more about recursion method 

L-I/0006 Repeat a String (L-I)/challenge.js

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+const repeatStringNumTimes = (str, num) => {
+  if (num < 1) {
+    return "";
+  }
+  // here I used recursion technique to solve the problem
+  return str + repeatStringNumTimes(str, num - 1);
+};
+
+// console.log(repeatStringNumTimes("AaA ", 3));
+
+module.exports = repeatStringNumTimes;