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Add example for sleuth and zipkin integration #264

5

Hello.I see #264 is marked help wanted . I add examples:cloud-sleuth-zipkin-grpc-client and examples:cloud-sleuth-zipkin-grpc-server which integration sleuth and zipkin .  

can supports grpc server enabled by config

2

i dependency grpc-spring-boot-starter in pom and i want to enabled/disabled grpc server in cofig like this: ``` grpc: server: port: 0 enabled: false ``` can supports the param grpc.server.enabled in...


如题 ``` public static String getDificultyString(int difficulty) { return new String(new char[difficulty]).replace('\0', '0'); } ```