Finished beginner section

docs/beginner/demo-missions.md

@@ -9,5 +9,50 @@ nav_order: 04
 1. Table of contents
 {:toc}
 
-{: .warning }
-> THIS DOCUMENT IS STILL WORK IN PROGRESS!
+The best way to get compftable with a Moose class is to try the demo missions of
+the class you want to learn. The Moose team created a lot of demo missions for
+most of the classes.
+
+## Download demo missions
+
+Go to the repository [MOOSE_MISSIONS]{:target="_blank"}, search the folder of
+the class, download the mission (`.miz`) and rum them.
+
+## Read the mission script
+
+In the same folder a `.lua` file with the same name is placed which is the
+included mission script. You can watch these mission scripts easily online at
+GitHub to understand what is happening in the mission.
+
+## Read documentation
+
+Next step is to read the [documentation]{:target="_blank"} of the class to
+understand the code of the demo mission.
+
+{: .note }
+> The documentation is quite long and might be confusing for beginners.
+> Start by looking at the description at the top of the documentation of a
+> class. It often contains examples and explanations. <br /><br />
+> Then search for the function names and look at the description of the
+> functions and its parameters.
+
+## Make small changes to the script
+
+Download the `.lua` file, change the parameters to suit your needs in
+[Notepad++]{:target="_blank"}, add it to the mission and rerun the mission.
+Observe what happens and adapt the code.
+
+If you want to use more functions combine them all up.
+
+{: .note }
+> But it is wise to do this in small steps. So it is easier to find errors.
+
+## Next step
+
+If the mission shows not the expected behaviour take a look at section
+[problems].
+
+[MOOSE_MISSIONS]: https://github.com/FlightControl-Master/MOOSE_MISSIONS/tree/develop
+[documentation]: https://flightcontrol-master.github.io/MOOSE_DOCS_DEVELOP/Documentation/index.html
+[Notepad++]: https://notepad-plus-plus.org/downloads/
+[problems]: problems.md