Rename exercises dir

Name it instead "topics" so it won't be
strange if some topics included "exercises" directory.

topics/openshift/solutions/my_first_app.md

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+## OpenShift - My First Application
+
+### Objectives
+
+1. Create a MySQL application
+2. Describe which OpenShift objects were created
+
+### Solution
+
+1. `oc new-app mysql`
+2. The following objects were created:
+  * ImageStream: 

topics/openshift/solutions/projects_101.md

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+## OpenShift - Projects 101
+
+### Objectives
+
+In a newly deployed cluster (preferably) perform the following:
+
+1. Login to the OpenShift cluster
+2. List all the projects
+3. Create a new project called 'neverland'
+4. Check the overview status of the current project
+
+### Solution
+
+```
+oc login -u YOUR_USER -p YOUR_PASSWORD_OR_TOKEN
+oc get projects # Empty output in new cluster
+oc new-project neverland
+oc status
+```