Add questions and exercises

In addition, move shell scripting questions into a separate file.

exercises/aws/solutions/create_spot_instances.md

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+## AWS EC2 - Spot Instances                                                                                                                                                  
+### Objectives             
+
+A. Create two Spot instances using a Spot Request with the following properties:
+
+* Amazon Linux 2 AMI
+* 2 instances as target capacity (at any given point of time) while each one has 2 vCPUs and 3 GiB RAM
+
+B. Create a single Spot instance using Amazon Linux 2 and t2.micro
+
+### Solution               
+
+A. Create Spot Fleets:
+
+1. Go to EC2 service
+2. Click on "Spot Requests"
+3. Click on "Request Spot Instances" button
+4. Set the following values for parameters:
+  * Amazon Linux 2 AMI
+  * Total target capacity -> 2
+  * Check "Maintain target capacity"
+  * vCPUs: 2
+  * Memory: 3 GiB RAM
+5. Click on Launch
+
+B. Create a single Spot instance:
+
+1. Go to EC2 service
+2. Click on "Instances"
+3. Click on "Launch Instances"
+4. Choose "Amazon Linux 2 AMI" and click on "Next"
+5. Choose t2.micro and click on "Next: Configure Instance Details"
+6. Select "Request Spot instances" 
+7. Set Maximum price above current price
+8. Click on "Review and Launch"