Add instructions for doing the assignments

INSTRUCTIONS.md

+Instructions for the assignments
+================================
+
+Some assignments need additional data or come with some example startup code
+for you to use. These are stored in a Git repository.
+
+Start by configuring Git (only need to do this once per computer):
+
+    git config --global user.name "John Doe"
+    git config --global user.email johndoe@example.com
+
+
+Clone the assignments repository
+--------------------------------
+
+Use your webbrowser to go to
+https://git.lumc.nl/humgen/programming-course-assignments
+
+Login using your LUMC account or the account you were emailed (notify a
+teacher if you cannot login). Click the *Fork repository* button on the
+right.
+
+The resulting page is your fork of the repository. Bookmark this page in your
+browser.
+
+On your fork, click the *HTTPS* button on the top and copy the resulting URL,
+e.g.,
+`https://git.lumc.nl/johndoe/programming-course-assignments.git`.
+
+Using this URL, clone the repository on your local computer:
+
+    git clone https://git.lumc.nl/johndoe/programming-course-assignments.git
+
+You now have a copy of the material on your computer. Change directory to it:
+
+    cd programming-course-assignments
+
+
+Do an assignment
+----------------
+
+You have to figure this out yourself.
+
+
+Commit and publish your solution
+--------------------------------
+
+For any files you created as part of your solution, run `git add`. For
+example:
+
+    git add solution_1.py
+
+Commit your changes to Git:
+
+    git commit -am 'Solution for assignment 1'
+
+Push your changes to the server:
+
+    git push
+
+You can repeat this section later when you did another assignment.
+
+
+Share your solution
+-------------------
+
+Go to your project page (the one you bookmarked) where you should now see what
+you pushed earlier.
+
+You can of course share your solution simply by sharing a link to your project
+page. However, there is a nice feature in GitLab called *merge requests* which
+you can use to directly submit you solution to the teachers.
+
+On your project page, click the green squared button on the right (with three
+horizontal white stripes) an choose *New merge request*. Make sure the *Source
+branch* is set to *master* on your fork and the *Target branch* is set to
+*master* on the original (*humgen*).
+
+Click *Compare branches*. Enter an appropriate title and perhaps a description
+before clicking *Submit merge request*. The resulting page can be used by you
+and the teachers to discuss your solution.
+
+
+Getting assignment updates
+--------------------------
+
+We might need to update the assignments repository after you forked it. In
+that case, we will notify you, but this is how to get the update on your local
+computer.
+
+Register the original repository (only need to do this once):
+
+    git remote add humgen https://git.lumc.nl/humgen/programming-course-assignments.git
+
+Get any updates:
+
+    git fetch humgen
+    git merge humgen/master

README.md

@@ -6,5 +6,7 @@ This repository contains some assignment material for the second installment
 of Human Genetics of the Leiden University Medical Center.
 
 See the
-[Trac Wiki](https://humgenprojects.lumc.nl/trac/humgenprojects/wiki/ProgrammingCourse)
+[course website](https://humgenprojects.lumc.nl/trac/humgenprojects/wiki/ProgrammingCourse)
 for more information.
+
+Also see the [instructions on using this repository](INSTRUCTIONS.md).