docs(contribution): changed Contribution instruction

Author: vetal2409

CONTRIBUTION.md

@@ -1,30 +1,27 @@
 # Contribution
+Thank you for your interest in making [Deploy Dashboard Plugin](https://github.com/jenkinsci/deploy-dashboard-plugin) even better and more awesome. Your contributions are highly welcome.
+
+Plugin source code is hosted on [GitHub](https://github.com/jenkinsci/deploy-dashboard-plugin). New feature proposals and bug fix proposals should be submitted as [GitHub pull requests](https://help.github.com/en/github/collaborating-with-issues-and-pull-requests/creating-a-pull-request). Your pull request will be evaluated by the [Jenkins job](https://jenkins.devops.namecheap.net/job/RND/job/jenkins-deploy-dashboard-plugin/).
 
-* [Beginners Guide to Contributing](https://wiki.jenkins.io/display/JENKINS/Beginners+Guide+to+Contributing)
-* [Jenkins Plugin Development Guild](https://wiki.jenkins.io/display/JENKINS/Plugin+tutorial#Plugintutorial-DistributingaPlugin)
-* [Original Repository](https://github.com/vipinsthename/environment-dashboard)
-* [Based on Pull Request](https://github.com/vipinsthename/environment-dashboard/pull/135)
 
 ## Development
 
-### Requirements
+There is an official [Jenkins Plugin Development Guild](https://wiki.jenkins.io/display/JENKINS/Plugin+tutorial) by Jenkins. All the details you will find there.
 
-* JDK 8.0 or later
+In short, you have to be familiar with java (jdk 1.8 is required) and maven build tool.
 
-### Development
+```bash
+./mvnw clean install
+```
+This command will build the plugin. The `hpi` file you can find in the `target` folder.
 
-[Debugging a Plugin](https://wiki.jenkins.io/display/JENKINS/Plugin+tutorial#Plugintutorial-DebuggingaPlugin)
+## Release (Only for Plugin's maintainers)
 
-`NOTE: findbugs is skipped, plugin has some code analysis issues. See pom.xml`
+Official documentation: [Performing a Plugin Release](https://jenkins.io/doc/developer/publishing/releasing/)
 
-```bash
-export MAVEN_OPTS="-Xdebug -Xrunjdwp:transport=dt_socket,server=y,address=8000,suspend=n"
-$ ./mvnw hpi:run
-```
+There is `Jenkinsfile.release` file in the root directory which you can use as jenkins pipeline
 
-### Build
+**For Namecheap employees only:** There is Jenkins job `https://{{NC_JENKINS_DOMAIN}}/job/RND/job/jenkins-deploy-dashboard-plugin/`.
+By running this job the new version (taken from [pom.xml](pom.xml) file) will be published.
 
-```bash
-$ ./mvnw package
-# This should create target/*.hpi file. Other users can use Jenkins' web UI to upload this plugin to Jenkins (or place it in $JENKINS_HOME/plugins.)
-```
+P.S. It usually takes time when the new version appears in the jenkins registry search.