added chapter examples for scope

Author: jwoolbright23

scope/chapter-examples/block-local-scope.js

@@ -0,0 +1,6 @@
+function myFunction() {
+    let i = 10;
+    return 10 + i;
+}
+
+console.log(i);

scope/chapter-examples/variable-shadowing.js

@@ -0,0 +1,18 @@
+const input = require('readline-sync');
+
+function hello(name) {
+    console.log('Hello,', name);
+    name = 'Ruth';
+    return doubleName(name);
+}
+
+function doubleName(name){
+    console.log(name+name);
+    return name+name;
+}
+
+let name = input.question("Please enter your name: ");
+
+hello(name);
+doubleName(name);
+console.log(name);