Feature/update docs for dates and array sizes (#382)

* Update docs for dates and array sizes

* Update comment with link

Author: GeorgDangl

README.md

@@ -424,6 +424,7 @@ The following types are supported:
 - string: Any string
 - boolean: The values 'true' or 'false'
 - enum: A value from the predefined enumValues array
+- date: ISO 8601 compliant date where only the date portion is intended to be used: https://github.com/buildingSMART/foundation-API#17-datetime-format
 - date-time: ISO 8601 compliant date: https://github.com/buildingSMART/foundation-API#17-datetime-format
 
 ### 3.1.5 Expressing User Authorization Through Project Extensions

swagger.yaml

@@ -2807,6 +2807,8 @@ components:
     project_custom_field_extension:
       type: object
       additionalProperties: true
+      required:
+        - minArraySize
       properties:
         id:
           type: string