add slides for motivation

git_gitlab_course/boilerplate-single.html

@@ -26,8 +26,23 @@ class: center, middle
 ---
 
 # Why to use _git_
+.center[<img src="images/xkcd_git.png" width="300">]
+
+---
+# Why to use git
+
+**Tracking**
+- keep track of who changed what
+- revert changes easily
+
+**Backup & distribute**
+- store important files remotely
+- easily copy and maintain on different devices
+- share and edit with collaborators
+
+**Focus**
+- strict version control helps you to work goal oriented
 
-<img src="images/xkcd_git.png" width="300">
 ---
 
 # How to use _git_
@@ -43,6 +58,8 @@ class: center, middle
 # Installing _git_
 Download *git* for your operating system from [https://git-scm.com/downloads](https://git-scm.com/downloads)
 
+<img src="images/git_download.png" width="100%">
+
 ---
 
 # Creating a local repository