Day 5 added

Readme.md

@@ -83,5 +83,18 @@ Here you can find the highlights of each day lecture, to avoid repetitive points
   * Multi-trace plots and its configuration
   * Bar and scatter plots
   * Reading data from a `CSV` files
-### Day 5: References with Bibtex ###
+### Day 5: References with Bibtex (Kai) ###
+What is a reference?
+What is a good reference?
+  * A simple reference Workflow with BibTEX
+  * Citation Styles
+  * Workflow Improvements
+  * Tools
+  ** BibTEX
+  ** JabRef
+  ** Citavi
+  ** Zotero
+
+Certficates 
+Feedback session