Add Custom Health Check Library to RFC

Signed-off-by: Stefan Prodan <stefan.prodan@gmail.com>

rfcs/0000-custom-health-checks/README.md

@@ -38,8 +38,8 @@ without having to change Flux source code for each new use case.
 
 ### Goals
 
-- provide a generic solution for user to customize the health check of custom resources
-- support non-standard resources in `kustomize-controller`
+- Provide a generic solution for users to customise the health check evaluation of custom resources.
+- Provide a space for the community to contribute custom health checks for popular custom resources.
 
 ### Non-Goals
 
@@ -114,6 +114,14 @@ of this kind reconciled by the Flux `Kustomization`.
 
 Note that all the Kubernetes core resources are discarded from the `healthCheckExprs` list.
 
+### Custom Health Check Library
+
+To help users define custom health checks, we will provide on the [fluxcd.io](https://fluxcd.io)
+website a library of custom health checks for popular custom resources.
+
+The Flux community will be able to contribute to this library by submitting pull requests
+to the `fluxcd/website` repository. 
+
 ### User Stories
 
 #### Configure health checks for non-standard custom resources