Merge pull request #66 from elezar/specversioning

[README] Add notes on versioning to SPEC.md

Author: bart0sh

README.md

@@ -1,7 +1,7 @@
 # CDI - The Container Device Interface
 ## What is CDI?
 
-CDI (Container Device Interface), is a specification, for container runtimes, to support third party devices.
+CDI (Container Device Interface), is a [specification](SPEC.md), for container runtimes, to support third party devices.
 
 CDI concerns itself only with enabling container to be device aware. Areas like resource management are explicitly left out of CDI (and is expected to be handled by the orchestrator). Because of this focus, the CDI specification is simple to implement and allows great flexibility to runtimes and orchestrators.
 

SPEC.md

@@ -10,14 +10,23 @@
 
 This is CDI **spec** version **0.3.0**.
 
-#### Released versions
+### Update policy
+
+Any modifications to the **spec** will result in at least a minor version bump. When releasing changes
+that only affect the API also implemented in this repository, the patch version will be bumped.
+
+*Note*: The **spec** is still under active development and there exists the posibility of breaking changes being
+introduced with new versions.
+### Released versions
 
 Released versions of the spec are available as Git tags.
 
 | Tag  | Spec Permalink   | Change |
 | -----| -----------------| -------|
 | v0.3.0 |   | Initial tagged release of Spec |
 
+*Note*: The initial release of a **spec** with version `v0.x.0` will be tagged as
+`v0.x.0` with subsequent changes to the API applicable to this version tagged as `v0.x.y`.
 ## Overview
 
 The _Container Device Interface_, or _CDI_ describes a mechanism for container runtimes to create containers which are able to interact with third party devices.