docs: update dev-api to include "create"

runtime/doc/develop.txt

@@ -244,6 +244,7 @@ with a {thing} that groups functions under a common concept).
 
 Use existing common {action} names if possible:
     add     Append to, or insert into, a collection
+    create  Create a new thing
     del     Delete a thing (or group of things)
     exec    Execute code
     get     Get a thing (or group of things by query)