add docs folder

README.md

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-# LTCC Module on Graph Algorithms and Models 2018
+# LTCC Module on Graph Algorithms and Models 2019
 
 Material related to the LTCC module "Graph algorithms and models".  
 

docs/README.md

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+# Using Git - Software and tutorials
+
+If you have never used **git** before, you might find this section 
+helpful. 
+
+## What is this git about?
+
+[git](https://git-scm.com/) is a Distributed Version Control System.
+This means that **git** allows people to work on the same set of
+files, adding, modifying, replacing, and deleting stuff without
+stepping on each others' toes. 
+
+For the scope of this project, you just need to know how to perform
+very basic **git** operations, such as importing an existing
+repository into your computer (a so-called **clone**),  adding files
+to a **git** repository, making your changes/addition available to
+others (a composition of a **commit** and a so-called **push**) and
+getting the latest updates from a repository (a so-called **pull**). 
+
+All the repositories needed for the module and your projects have
+already been created at
+[https://mygit.mine.nu/LTCC_2019](https://mygit.mine.nu/LTCC_2019),
+so you don't need to create any repository at all. 
+
+
+## OK, that's still pretty obscure: where do I find more information?
+
+Please find below a short list of tutorials on basic **git** usage: 
+
+* [git, the simple guide](https://rogerdudler.github.io/git-guide/)
+* [git for beginners @StackOverflow](https://stackoverflow.com/questions/315911/git-for-beginners-the-definitive-practical-guide#320140)  
+* [an intro to git for
+  beginners](https://product.hubspot.com/blog/git-and-github-tutorial-for-beginners)
+
+## Do I really need to type long commands on my keyboard to use git?
+
+Originally, **git** was just a terminal-based application, but
+nowadays there exist a lot of Graphical User Interfaces. A
+(non-comprehensive) list of **git** applications  is available [on the
+official git webpage](https://git-scm.com/download/guis/)
+
+
+## Experimenting with git
+
+There is a [sandbox
+repository](https://mygit.mine.nu/LTCC_2019/sandbox) that you can
+use to start experimenting with git. In order to use it, you just need 
+to _clone_ it:
+
+```
+git clone https://mygit.mine.nu/LTCC_2019/sandbox
+```
+
+and then you can start adding new files, modofying existing ones, etc. 
+
+## Asking for help
+
+If you need any help with using git, and you can't find the answer on
+the web, then just write an email to the lecturer ;-)
+ 
+
+