update readme

Signed-off-by: stoneshi-yunify <[email protected]>

Author: stoneshi-yunify

README.md

@@ -1,29 +1,18 @@
 # ks-jenkins
-Jenkins distribution for [kubesphere](https://github.com/kubesphere/kubesphere)
-
-`ks-jenkins` is an out-of-the-box solution which base on [custom-war-packager](https://github.com/jenkinsci/custom-war-packager).
+Jenkins distribution for [kubesphere](https://github.com/kubesphere/kubesphere), but you may use it for other purposes. It's just a standard jenkins plus some plugins.
 
 # Get started
 The docker images are below:
 
-| | |
-|---|---|
-| official | `kubesphere/ks-jenkins:v3.5.0-2.346.3` |
-| experimental | `kubespheredev/ks-jenkins:master` |
-
-## Build from source
-
-[jcli](https://github.com/jenkins-zh/jenkins-cli) is a handy tool which can generate jenkins.war and docker image by one command line.
-
-> For some reasons, you need to config your Maven settings file. Please [see also](https://github.com/kubesphere/ks-jenkins/issues/16).
-
-Build it via: `make build`
-
-Run it via: `make run`
-
-# Plugins
-Please pay attention to these plugins, we still need to keep use a special version of them:
-
-| Name | Version | Description |
-|---|---|---|
-| `pipeline-input-step` | `2.12-rc390.24ce2a334298` | Depends on [PR-33](https://github.com/jenkinsci/pipeline-input-step-plugin/pull/33) |
+| Type         | Image                                                                      |
+|--------------|----------------------------------------------------------------------------|
+| official     | [latest-release](https://github.com/kubesphere/ks-jenkins/releases/latest) |
+| experimental | `kubesphere/ks-jenkins:master`                                             |
+
+## Build your own jenkins image
+1. Clone this repo
+2. Modify the Dockerfile and plugins.txt as you need.
+3. Build the image
+```bash
+docker build -t <your-image-name> .
+```