feat: add solution

src/index.js

@@ -1,3 +1,37 @@
-module.exports = function toReadable (number) {
-
+module.exports = function toReadable(number) {
+    let unit = ['one', 'two', 'three', 'four', 'five', 'six', 'seven', 'eight', 'nine'];
+    let numbersFrom11to19 = ['eleven', 'twelve', 'thirteen', 'fourteen', 'fifteen', 'sixteen', 'seventeen', 'eighteen', 'nineteen']
+    let dozens = ['ten', 'twenty', 'thirty', 'forty', 'fifty', 'sixty', 'seventy', 'eighty', 'ninety'];
+    let hundred = 'hundred'
+    let num = Array.from(String(number))
+
+
+    if (number === 0) {
+        return 'zero'
+    } else if (number < 10 && number !== 0) {
+        return unit[num[0] - 1];
+    } else if (number === 10) {
+        return dozens[0];
+    } else if (number > 10 && number < 20) {
+        return numbersFrom11to19[num[1] - 1];
+    } else if (number > 19 && number < 100) {
+        if (num[1] !== String(0)) {
+            return dozens[num[0] - 1] + ' ' + unit[num[1] - 1];
+        } else {
+            return dozens[num[0] - 1];
+        }
+    } else if (number >= 100 && number < 1000) {
+        if (num[1] > 0 || num[2] > 0) {
+            if (Number(num[1] + num[2]) > 10 && Number(num[1] + num[2]) < 20) {
+                return unit[num[0] - 1] + ' ' + hundred + ' ' + numbersFrom11to19[num[2] - 1];
+            } else if (Number(num[1]) > 0 && Number(num[1]) < 10 && num[2] === '0') {
+                return unit[num[0] - 1] + ' ' + hundred + ' ' + dozens[num[1] - 1];
+            } else if (Number(num[2]) > 0 && Number(num[2]) < 10 && num[1] === '0') {
+                return unit[num[0] - 1] + ' ' + hundred + ' ' + unit[num[2] - 1];
+            } else if (Number(num[2]) > 0 && Number(num[2]) < 10 && Number(num[1]) > 0 && Number(num[1]) < 10) {
+                return unit[num[0] - 1] + ' ' + hundred + ' ' + dozens[num[1] - 1] + ' ' + unit[num[2] - 1];
+            }
+        }
+        return unit[num[0] - 1] + ' ' + hundred;
+    }
 }