Rename exercises dir

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

topics/containers/solutions/containerized_db.md

@@ -0,0 +1,26 @@
+# Containerized DB
+
+1. Run a container with a database of any type of you prefer (MySql, PostgreSQL, Mongo, etc.)
+2. Verify the container is running
+3. Access the container and create a new table (or collection, depends on which DB type you chose) for students
+4. Insert a row (or document) of a student
+5. Verify the row/document was added
+
+
+## Solution
+
+```
+# Run the container
+podman run --name mysql -e MYSQL_USER=mario -e MYSQL_PASSWORD=tooManyMushrooms -e MYSQL_DATABASE=university -e MYSQL_ROOT_PASSWORD=MushroomsPizza -d mysql
+
+# Verify it's running
+podman ps
+
+# Add student row to the database
+podman exec -it mysql /bin/bash
+mysql -u root
+use university;
+CREATE TABLE Students (id int NOT NULL, name varchar(255) DEFAULT NULL, PRIMARY KEY (id));
+insert into Projects (id, name) values (1,'Luigi');
+select * from Students;
+```