Update ApiDesignConsiderations.md

As discussed during the meeting.

Author: tlohmar

documentation/SupportingDocuments/ApiDesignConsiderations.md

@@ -3,6 +3,8 @@
 ## Introduction
 The API design considerations are derived from the API usage scenarios (PR#12). The aim of the API is to hide telco specific complexity, while offering the needed capabilities. There may be different realization of the needed network capabilities, e.g. using shared network slices or even exclusive network slices.
 
+This is an informal document, which should support the API design. The document may be updated during the API design process.
+
 ## General Considerations
 The API should allow combination with other CAMARA APIs, such as QOD, Connectivity Insights / Monitoring, etc.
 The API should follow the CAMARA commonalities guidelines and (potentially) align with other API designs. For example, QOD offers an endpoint for discovery of profiles and another endpoint for activation/deactivation of profiles.