Support versioning by moving /specification to /specification/1.0

Author: kpshek

docs/specification.md renamed to docs/specification/1.0.md

@@ -1,5 +1,8 @@
 # CDS Services
 
+!!! info "1.0 Draft"
+    This is the draft of the 1.0 release of the CDS Hooks specification. We are currently working towards a 1.0 release and would love your feedback and proposed changes. Look at our <a href="http://github.com/cds-hooks/docs/issues">current issue list</a> and get involved!
+
 ## Discovery
 
 ```shell