add: map exercises and quiz

22-maps/exercises/README.md

@@ -1,5 +1,15 @@
-# IDEAS
+# Header
 
-* Retrieve sorted map keys
+What you will learn?
 
-* Roman literals
+1. **[Warm Up](https://github.com/inancgumus/learngo/tree/master/22-maps/exercises/01-warm-up)**
+
+    Create and print the maps.
+
+2. **[Populate and Lookup](https://github.com/inancgumus/learngo/tree/master/22-maps/exercises/02-populate)**
+
+    Add elements to the maps that you've declared in the first exercise, and try them by looking up for the keys.
+
+3. **[Hogwarts Students](https://github.com/inancgumus/learngo/tree/master/22-maps/exercises/03-students)**
+
+    Create a program that returns the students by the given Hogwarts house name.