Finish objects section

Signed-off-by: Michael Tang <michael.h.tang@gmail.com>

const.js

@@ -0,0 +1,13 @@
+const isRaining = true
+
+// isRaining = false
+console.log(isRaining)
+
+const person = {
+    age: 28
+}
+
+person.age = 29
+// person = {}
+
+console.log(person)