add sandbox host line + cii best practices badge (#738)

* add sandbox host line + cii best practices badge

Signed-off-by: clux <sszynrae@gmail.com>

* Update README.md

Co-authored-by: kazk <kazk.dev@gmail.com>

* Update README.md

Co-authored-by: kazk <kazk.dev@gmail.com>

* Update README.md

Co-authored-by: Teo Klestrup Röijezon <teo.roijezon@stackable.de>

Co-authored-by: kazk <kazk.dev@gmail.com>
Co-authored-by: Teo Klestrup Röijezon <teo.roijezon@stackable.de>

Author: 3 people

README.md

@@ -1,15 +1,15 @@
 # kube-rs
 
-[![CI](https://github.com/kube-rs/kube-rs/actions/workflows/ci.yml/badge.svg)](https://github.com/kube-rs/kube-rs/actions/workflows/ci.yml)
-[![Client Capabilities](https://img.shields.io/badge/Kubernetes%20client-Silver-blue.svg?style=plastic&colorB=C0C0C0&colorA=306CE8)](http://bit.ly/kubernetes-client-capabilities-badge)
-[![Client Support Level](https://img.shields.io/badge/kubernetes%20client-beta-green.svg?style=plastic&colorA=306CE8)](http://bit.ly/kubernetes-client-support-badge)
 [![Crates.io](https://img.shields.io/crates/v/kube.svg)](https://crates.io/crates/kube)
 [![Rust 1.56](https://img.shields.io/badge/MSRV-1.56-dea584.svg)](https://github.com/rust-lang/rust/releases/tag/1.56.0)
 [![Discord chat](https://img.shields.io/discord/500028886025895936.svg?logo=discord&style=plastic)](https://discord.gg/tokio)
+[![Client Capabilities](https://img.shields.io/badge/Kubernetes%20client-Silver-blue.svg?style=plastic&colorB=C0C0C0&colorA=306CE8)](http://bit.ly/kubernetes-client-capabilities-badge)
+[![Client Support Level](https://img.shields.io/badge/kubernetes%20client-beta-green.svg?style=plastic&colorA=306CE8)](http://bit.ly/kubernetes-client-support-badge)
+[![Best Practices](https://bestpractices.coreinfrastructure.org/projects/5413/badge)](https://bestpractices.coreinfrastructure.org/projects/5413)
 
-Rust client for [Kubernetes](http://kubernetes.io) in the style of a more generic [client-go](https://github.com/kubernetes/client-go), a runtime abstraction inspired by [controller-runtime](https://github.com/kubernetes-sigs/controller-runtime), and a derive macro for [CRDs](https://kubernetes.io/docs/tasks/extend-kubernetes/custom-resources/custom-resource-definitions/) inspired by [kubebuilder](https://book.kubebuilder.io/reference/generating-crd.html).
+A [Rust](https://rust-lang.org/) client for [Kubernetes](http://kubernetes.io) in the style of a more generic [client-go](https://github.com/kubernetes/client-go), a runtime abstraction inspired by [controller-runtime](https://github.com/kubernetes-sigs/controller-runtime), and a derive macro for [CRDs](https://kubernetes.io/docs/tasks/extend-kubernetes/custom-resources/custom-resource-definitions/) inspired by [kubebuilder](https://book.kubebuilder.io/reference/generating-crd.html). Hosted by [CNCF](https://cncf.io/) as a [Sandbox Project](https://www.cncf.io/sandbox-projects/)
 
-These crates make certain assumptions about the kubernetes [apimachinery](https://github.com/kubernetes/apimachinery/blob/master/pkg/apis/meta/v1/types.go) + [api concepts](https://kubernetes.io/docs/reference/using-api/api-concepts/) to enable generic abstractions. These abstractions allow rust reinterpretations of reflectors, informers, controllers, and custom resource interfaces, so that you can write applications easily.
+These crates build upon Kubernetes [apimachinery](https://github.com/kubernetes/apimachinery/blob/master/pkg/apis/meta/v1/types.go) + [api concepts](https://kubernetes.io/docs/reference/using-api/api-concepts/) to enable generic abstractions. These abstractions allow Rust reinterpretations of reflectors, controllers, and custom resource interfaces, so that you can write applications easily.
 
 ## Installation