[dunemodule] Update exercise README on how to create a GitLab project.

exercises/exercise-dunemodule/README.md

@@ -84,13 +84,23 @@ cd appl
 * Login with your username and password at https://git.iws.uni-stuttgart.de/
 
 Note: If you don't have an account create one. We allow anyone to host repositories
-on our GitLab instance as long as it is DuMuX related.
+on our GitLab instance as long as it is DuMuX related. If you created a GitLab account recently or just now, one of
+the administrators first has to increase the number of permitted personal projects for your account before you can create
+your own project.
 
-* Click the **New project** button
+* Click the **New project** button.
 
-* Specify your project name and click the **Create project** button
+* Then choose to **Create blank project**.
 
-* Follow the given instructions for an *existing folder*
+* Specify your project name, untick the box *Initialize repository with a README* and click the **Create project** button.
+
+* Follow the given instructions for an *existing folder*.
+
+Hint: if you have not done so already, be sure to inform your computer of your git account with the following commands:
+```bash
+git config --global user.name "FIRST_NAME LAST_NAME"
+git config --global user.email "YOUR_EMAIL_ADDRESS"
+```
 
 **Important**: Before executing the `git add .` command, you should add your cmake build folder to `.gitignore`.
 The easiest way to do so is to copy the `.gitignore` file from the dumux module into your module path. If everything

slides/dunemodule.md

@@ -61,6 +61,8 @@ Configuring and compiling the stack of modules is done via the script `dunecontr
 
 ```bash
 cd my-module-folder
+git config --global user.name "FIRST_NAME LAST_NAME"
+git config --global user.email "YOUR_EMAIL_ADDRESS"
 git init --initial-branch=main
 git remote add origin https://git.iws.uni-stuttgart.de/Namespace/my-module.git
 git add .