added modules section, starter code from exporting-modules walkthrough

Author: jwoolbright23

modules/exporting-modules/index.js

@@ -0,0 +1 @@
+// Import the modules exported from practiceExports.js below:

modules/exporting-modules/practiceExports.js

@@ -0,0 +1,16 @@
+function isPalindrome(str){
+    return str === str.split('').reverse().join('');
+}
+
+function evenOrOdd(num){
+    if (num%2===0){
+        return "Even";
+    } else {
+        return "Odd";
+    }
+}
+
+function randomArrayElement(arr){
+    let index = Math.floor(Math.random()*arr.length);
+    return arr[index];
+}