docs: update build script name for aspnetcore readme (#235)

Co-authored-by: Michael Ericksen <[email protected]>

Examples/aspnetcore/README.md

@@ -30,7 +30,7 @@ First, we need to compile the example
 ```bash
 $ pwd
 ~/zipkin4net/
-$ ./buildAndTest.sh
+$ ./build.sh
 ```
 
 In separate tabs or windows, start each of frontend and backend:
@@ -54,6 +54,12 @@ curl -sSL https://zipkin.io/quickstart.sh | bash -s
 java -jar zipkin.jar
 ```
 
+Alternatively, if you use Docker, follow the [Zipkin quickstart](https://zipkin.io/pages/quickstart.html) to run the same service:
+
+```bash
+docker run -d -p 9411:9411 openzipkin/zipkin
+```
+
 ## Advanced setup
 
 If you want to use different ports that 8081 and 9000 for frontend and backend, you have to do two things: