add circuitbreak service example

examples/circuitbreaker/service/README-zh.md

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+# Polaris Go
+
+[English](./README.md) | 中文
+
+## 使用实例故障熔断
+
+北极星支持及时熔断异常的服务、接口、实例或者实例分组，降低请求失败率。
+## 如何使用
+
+### 构建可执行文件
+
+构建 provider
+
+```
+# linux/mac
+cd ./provider
+go build -o provider
+
+# windows
+cd ./consumer
+go build -o provider.exe
+```
+
+构建 consumer
+
+```
+# linux/mac
+cd ./consumer
+go build -o consumer
+
+# windows
+cd ./consumer
+go build -o consumer.exe
+```
+### 进入控制台
+
+预先通过北极星控制台创建对应的服务，如果是通过本地一键安装包的方式安装，直接在浏览器通过127.0.0.1:8080打开控制台
+
+### 设置熔断规则
+
+![create_circuitbreaker](./image/create_circuitbreaker.png)
+
+### 修改配置
+
+指定北极星服务端地址，需编辑polaris.yaml文件，填入服务端地址
+
+```
+global:
+  serverConnector:
+    addresses:
+    - 127.0.0.1:8091
+```
+
+### 执行程序
+
+### 执行程序
+
+运行构建出的**provider**可执行文件
+
+```
+# linux/mac运行命令
+./provider
+
+# windows运行命令
+./provider.exe
+```
+
+运行构建出的**consumer**可执行文件
+
+```
+# linux/mac运行命令
+./provider
+
+# windows运行命令
+./provider.exe
+```
+
+### 验证
+
+快速的发起多次**curl**请求命令
+
+```
+-- 第一次发起请求
+curl -H 'user-id: polaris' http://127.0.0.1:18080/echo
+
+Hello, My host : 127.0.0.1:8888
+Hello, My host : 127.0.0.1:9999
+...
+Hello, My host : 127.0.0.1:9999
+
+-- 关闭某些provider，在发起请求
+
+"Hello, My host : %s:%d", svr.host, svr.port
+dial tcp 127.0.0.1:37907: connect: connection refused
+
+<多次调用触发熔断>
+
+it's fallback
+...

examples/circuitbreaker/service/README.md

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+# Polaris Go
+
+English | [中文](./README-zh.md)
+
+## Use troubleshooting
+
+Polaris supports timely fuse from abnormal services, interfaces, examples, or instance packets, and reduce the request failure rate.
+## How to use
+
+### Build an executable
+
+Build provider
+
+```
+# linux/mac
+cd ./provider
+go build -o provider
+
+# windows
+cd ./consumer
+go build -o provider.exe
+```
+
+Build consumer
+
+```
+# linux/mac
+cd ./consumer
+go build -o consumer
+
+# windows
+cd ./consumer
+go build -o consumer.exe
+```
+### Enter console
+
+Create a corresponding service through the Arctic Star Console, if you are installed by a local one-click installation package, open the console directly on the browser through 127.0.0.1:8080
+
+### Set fuck rule
+
+![create_circuitbreaker](./image/create_circuitbreaker.png)
+
+### Change setting
+
+Specify the Arctic Star server address, you need to edit the Polaris.yaml file, fill in the server address.
+
+```
+global:
+  serverConnector:
+    addresses:
+    - 127.0.0.1:8091
+```
+
+### Execute program
+
+Run the built **provider** executable
+
+```
+# linux/mac
+./provider
+
+# windows
+./provider.exe
+```
+
+Run the built-in **consumer** executable
+
+```
+# linux/mac
+./provider
+
+# windows
+./provider.exe
+```
+
+### Verify
+
+Quick initiatures multiple times **curl** request command
+
+```
+-- First initiative
+curl -H 'user-id: polaris' http://127.0.0.1:18080/echo
+
+Hello, My host : 127.0.0.1:8888
+Hello, My host : 127.0.0.1:9999
+...
+Hello, My host : 127.0.0.1:9999
+
+-- Close any provider，request again
+
+"Hello, My host : %s:%d", svr.host, svr.port
+dial tcp 127.0.0.1:37907: connect: connection refused
+
+<trigger the cirtcuitbreaker>
+
+it's fallback
+...

examples/circuitbreaker/service/consumer/go.mod

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+module github.com/polarismesh/polaris-go-circuitbreaker-consumer
+
+go 1.17
+
+require github.com/polarismesh/polaris-go v1.5.5
+
+require (
+	github.com/beorn7/perks v1.0.1 // indirect
+	github.com/cespare/xxhash/v2 v2.1.2 // indirect
+	github.com/dlclark/regexp2 v1.7.0 // indirect
+	github.com/golang/protobuf v1.5.2 // indirect
+	github.com/google/uuid v1.3.0 // indirect
+	github.com/hashicorp/errwrap v1.1.0 // indirect
+	github.com/hashicorp/go-multierror v1.1.1 // indirect
+	github.com/matttproud/golang_protobuf_extensions v1.0.2-0.20181231171920-c182affec369 // indirect
+	github.com/mitchellh/go-homedir v1.1.0 // indirect
+	github.com/modern-go/reflect2 v1.0.2 // indirect
+	github.com/natefinch/lumberjack v2.0.0+incompatible // indirect
+	github.com/pkg/errors v0.9.1 // indirect
+	github.com/polarismesh/specification v1.4.1 // indirect
+	github.com/prometheus/client_golang v1.12.2 // indirect
+	github.com/prometheus/client_model v0.2.0 // indirect
+	github.com/prometheus/common v0.32.1 // indirect
+	github.com/prometheus/procfs v0.7.3 // indirect
+	github.com/spaolacci/murmur3 v1.1.0 // indirect
+	go.uber.org/atomic v1.10.0 // indirect
+	go.uber.org/multierr v1.8.0 // indirect
+	go.uber.org/zap v1.21.0 // indirect
+	golang.org/x/net v0.2.0 // indirect
+	golang.org/x/sys v0.2.0 // indirect
+	golang.org/x/text v0.4.0 // indirect
+	google.golang.org/genproto v0.0.0-20221014213838-99cd37c6964a // indirect
+	google.golang.org/grpc v1.51.0 // indirect
+	google.golang.org/protobuf v1.28.1 // indirect
+	gopkg.in/yaml.v2 v2.4.0 // indirect
+)
+
+replace github.com/polarismesh/polaris-go => ../../../../