update readme

README.md

@@ -7,4 +7,38 @@ StrategyExecutor is a gitee event massage executor, it recieves rules and events
 ![](http://assets.processon.com/chart_image/6163e23e0791290cc7819291.png)
 
 #### Domain Model
-![](http://assets.processon.com/chart_image/616428d163768921fa176b05.png)
+![](http://assets.processon.com/chart_image/616428d163768921fa176b05.png)
+
+#### How to contribute
+If you’re interested in contributing code, the best starting point is to have a look at our Gitee issues to see which tasks are the most urgent. 
+
+Sunmao accepts PR's (pull requests) from all developers.
+
+Issues can be submitted by anyone - either seasoned developers or newbies.
+
+#### Installation
+
+- **Step 1** Setting up the k8s environment, Google GKE or minikube or microk8s are ok for deployment.
+
+- **Step 2** Setting up webhook url in gitee projects, in order to receive issue event requests from you project.
+
+- **Step 3** Setting up `api_url`, `Org`, `Repo`, and `gitee_token` environment variables.
+
+- **Step 4** If you use RabbitMQ as a message queue, you should set these environment variables:
+```
+	RMQ_QUEUE_NAME := os.Getenv("RMQ_QUEUE_NAME")
+	RMQ_HOST := os.Getenv("RMQ_HOST")
+	RMQ_VHOST := os.Getenv("RMQ_VHOST")
+	RMQ_USER := os.Getenv("RMQ_USER")
+	RMQ_PASS := os.Getenv("RMQ_PASS")
+	RMQ_PORT := os.Getenv("RMQ_PORT")
+	RMQ_ROUTINGKEY := os.Getenv("RMQ_ROUTINGKEY")
+	RMQ_EXCHANGE_NAME := os.Getenv("RMQ_EXCHANGE_NAME")
+	RMQ_EXCHANGE_TYPE := os.Getenv("RMQ_EXCHANGE_TYPE")
+```
+and then setting up a RabbitMQ environment by yourself.
+
+
+- **Step 5** Using Dockerfile to build docker image and then upload it to DockerHub.
+
+- **Step 6** Deploy the project by yaml on k8s.