chore: add docs link and change beta to RC (#1673) [ci skip]

README.md

@@ -1,6 +1,6 @@
 # vue-next [![beta](https://img.shields.io/npm/v/vue/next.svg)](https://www.npmjs.com/package/vue/v/next) [![CircleCI](https://circleci.com/gh/vuejs/vue-next.svg?style=svg&circle-token=fb883a2d0a73df46e80b2e79fd430959d8f2b488)](https://circleci.com/gh/vuejs/vue-next)
 
-## Status: Beta
+## Status: Release Candidate
 
 - All planned RFCs have been merged.
 
@@ -14,6 +14,8 @@ Please note that there could still be undocumented behavior inconsistencies with
 
 In addition, the current implementation requires native ES2015+ in the runtime environment and does not support IE11 (yet). The IE11 compatible build will be worked on after we have reached RC stage.
 
+The documentation of Vue 3 can be found at https://v3.vuejs.org/
+
 ## Status of the rest of the framework
 
 ### Vue Router