Add AWS exercises and questions

exercises/aws/asg_dynamic_scaling_policy.md

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+## AWS Auto Scaling Groups - Dynamic Scaling Policy
+
+### Requirements
+
+1. Existing Auto Scaling Group with maximum capacity set to at least 3
+2. One running EC2 instance with max of 4 CPUs
+
+### Objectives
+
+1. Create a dynamic scaling policy with the following properties
+  1. Track average CPU utilization
+  2. Target value should be 70%
+2. Increase the CPU utilization to at least 70%
+  1. Do you see change in number of instances?
+1. Decrease CPU utilization to less than 70%
+  1. Do you see change in number of instances?