Add different solutions to AWS exercises

Not only console solutions, but also Terraform and Pulumi.

In addition, this change fixes issues #279 and #280

topics/aws/exercises/new_vpc/exercise.md

@@ -1,6 +1,11 @@
-## AWS VPC - My First VPC
+# My First VPC
 
-### Objectives
+## Objectives
 
 1. Create a new VPC
-  1. It should have a CIDR that supports using at least 60,000 hosts
+   1. It should have a CIDR that supports using at least 60,000 hosts
+   2. It should be named "exercise-vpc"
+
+## Solution
+
+Click [here](solution.md) to view the solution