adds debian broken machines

modules/qualifying/exercise_broken_machines.md

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+# Broken Machines
+
+Over the coarse of my Linux career I broke quite a few machines.
+Hopefully you can fix them for me.
+The username and password of the first account created is isib/isib unless mentioned in the exercise.
+
+## Broken Machine 1
+
+I messed up and forgot to install grub during the Debian installation.
+Can you find a way to fix this for me please?
+Thanks!
+
+![broken 1](./assets/debian_broken_1.png)
+
+## Broken Machine 2
+
+This machine seems to boot into `htop` and nothing else!
+There must be a way to fix this without having to reinstall the machine.
+
+![broken 2](./assets/debian_broken_2.png)
+
+## Broken Machine 3
+
+Not `htop` again!
+
+![broken 3](./assets/debian_broken_3.png)
+
+## Broken Machine 4
+
+I forgot my password...
+
+![broken 4](./assets/debian_broken_4.png)