add makefile

README.md

@@ -11,14 +11,18 @@ Follow the guide at https://mkbd65.xengi.de to build a case for your phone.
 
 _TBA_
 
+```shell
+make main
+```
+
 ## Generate a key set
 
 To generate the key set you can either use a predefined layout or generate your own. There are two predefined layouts
 for English US International and German. You can generate the 3D files for them with the following commands:
 
 ```shell
-make keys:en-us-intl
-make keys:de
+make keys_en-us-intl
+make keys_de
 ```
 
 This will generate the neccessary 3MF and STL files that you can use for your 3D printers slicer software. I recommend a