Update README.md

Signed-off-by: Bernd <[email protected]>

README.md

@@ -1,6 +1,6 @@
 Official resources for *SEEBURGER BIS 6.7* customers.
 
-## Subdirectories
+## Repository Structure
 
 * [`installation`](installation/) - scripts and templates mentioned in the **SEEBURGER BIS6 Installation Manual** and the **BIS6 System Database Manual**.
 * [`tests`](tests/) - Maven/Java project used to test some of the resources in this repository.