Add docs for aas environment upload endpoint (eclipse-basyx#231)

basyx.aasenvironment/Readme.md

@@ -37,3 +37,10 @@ Furthermore, if Identifiables (AAS, Submodels, ConceptDescriptions) are already
 
 
 For examples, see [application.properties](./basyx.aasenvironment.component/src/main/resources/application.properties)
+
+
+## AAS Environment Upload Endpoint
+
+AAS environments (e.g. XML, JSON, AASX) can be uploaded to the `/upload` endpoint. 
+
+The upload follows the same rules as the preconfiguration in terms of handling existing AAS, submodels and concept descriptions. In order for the file to be recognized correctly, please make sure that its MIME type is properly configured.