start explaining use case

Usecases/README.md

@@ -13,7 +13,7 @@ Each of the folders contains subfolders such as `one-patch`, `two-patch` and `mu
 keep things tidy. You may introduce your own ordering, of course.
 
 >>>
-**Waring**
+**!Waring!**
 The usecases in the various `Archive` folders are obsolete.
 They were used at one point in time in the development
 of the LDD code usually for debugging but have been abandoned at one point in
@@ -24,7 +24,7 @@ in the non-Archive folders. Most likely, they will not work anymore.
 In some cases these scripts are being kept for reference or because older
 simulation datat based on the older scripts have been used.
 If you want to revive some of these examples, copy one of the official examples
-and update that copy with information in these scripts
+and update that copy with information in the obsolete scripts.
 >>>
 ## How to create your own usecases