docs: add artifacthub badge to readme (#605)

## What type of PR is this?

/kind documentation

## What this PR does / why we need it:

add artifacthub badge to readme

## Which issue(s) this PR fixes:

<!--
*Automatically closes linked issue when PR is merged.
Usage: `Fixes #<issue number>`, or `Fixes (paste link of issue)`.
_If PR is about `failing-tests or flakes`, please post the related
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Fixes #

README-pt.md

@@ -21,7 +21,8 @@
 </p>
 
 [![Karpor](https://github.com/KusionStack/karpor/actions/workflows/release.yaml/badge.svg)](https://github.com/KusionStack/karpor/actions/workflows/release.yaml)
-[![GitHub release](https://img.shields.io/github/release/KusionStack/karpor.svg)](https://github.com/KusionStack/karpor/releases)
+[![GitHub Release](https://img.shields.io/github/release/KusionStack/karpor.svg)](https://github.com/KusionStack/karpor/releases)
+[![Artifact Hub](https://img.shields.io/endpoint?url=https://artifacthub.io/badge/repository/karpor)](https://artifacthub.io/packages/helm/kusionstack/karpor)
 [![Go Report Card](https://goreportcard.com/badge/github.com/KusionStack/karpor)](https://goreportcard.com/report/github.com/KusionStack/karpor)
 [![Coverage Status](https://coveralls.io/repos/github/KusionStack/karpor/badge.svg)](https://coveralls.io/github/KusionStack/karpor)
 [![Go Reference](https://pkg.go.dev/badge/github.com/KusionStack/karpor.svg)](https://pkg.go.dev/github.com/KusionStack/karpor)

README-zh.md

@@ -20,7 +20,8 @@
 </p>
 
 [![Karpor](https://github.com/KusionStack/karpor/actions/workflows/release.yaml/badge.svg)](https://github.com/KusionStack/karpor/actions/workflows/release.yaml)
-[![GitHub release](https://img.shields.io/github/release/KusionStack/karpor.svg)](https://github.com/KusionStack/karpor/releases)
+[![GitHub Release](https://img.shields.io/github/release/KusionStack/karpor.svg)](https://github.com/KusionStack/karpor/releases)
+[![Artifact Hub](https://img.shields.io/endpoint?url=https://artifacthub.io/badge/repository/karpor)](https://artifacthub.io/packages/helm/kusionstack/karpor)
 [![Go Report Card](https://goreportcard.com/badge/github.com/KusionStack/karpor)](https://goreportcard.com/report/github.com/KusionStack/karpor)
 [![Coverage Status](https://coveralls.io/repos/github/KusionStack/karpor/badge.svg)](https://coveralls.io/github/KusionStack/karpor)
 [![Go Reference](https://pkg.go.dev/badge/github.com/KusionStack/karpor.svg)](https://pkg.go.dev/github.com/KusionStack/karpor)

README.md

@@ -20,7 +20,8 @@
 </p>
 
 [![Karpor](https://github.com/KusionStack/karpor/actions/workflows/release.yaml/badge.svg)](https://github.com/KusionStack/karpor/actions/workflows/release.yaml)
-[![GitHub release](https://img.shields.io/github/release/KusionStack/karpor.svg)](https://github.com/KusionStack/karpor/releases)
+[![GitHub Release](https://img.shields.io/github/release/KusionStack/karpor.svg)](https://github.com/KusionStack/karpor/releases)
+[![Artifact Hub](https://img.shields.io/endpoint?url=https://artifacthub.io/badge/repository/karpor)](https://artifacthub.io/packages/helm/kusionstack/karpor)
 [![Go Report Card](https://goreportcard.com/badge/github.com/KusionStack/karpor)](https://goreportcard.com/report/github.com/KusionStack/karpor)
 [![Coverage Status](https://coveralls.io/repos/github/KusionStack/karpor/badge.svg)](https://coveralls.io/github/KusionStack/karpor)
 [![Go Reference](https://pkg.go.dev/badge/github.com/KusionStack/karpor.svg)](https://pkg.go.dev/github.com/KusionStack/karpor)