Added import statement hint to readme

README.md

@@ -11,7 +11,16 @@
 > This branch is a strict testing version **derived from the master branch**.  
 > - Not all **documentation** is fully up to date yet.  
 > - The **examples** are also not completely updated to reflect the strict changes.  
->  
+>
+>  Use this import statment in XML or XSD files to use this strict Version 
+> ```xml    
+><xs:import
+>   namespace="https://ptb.de/si"
+>   schemaLocation="https://gitlab1.ptb.de/d-ptb/d-si/xsd-d-si/-/raw/strict/SI_Format.xsd "/>
+>```
+>
+>
+>
 > **Please note:** The master branch remains the primary and officially supported version.
 
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