新增learn-kubernetes（https://github.com/yyong-brs/learn-kubernetes）相关文件

learn/learn-kubernetes-master/kiamol/ch15/lab/README.md

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+# Ch15 lab
+
+## Setup
+
+Deploy the ingress controller:
+
+```
+kubectl apply -f lab/ingress-nginx/
+```
+
+## Sample Solution
+
+The background info is in the [Nginx ingress controller spec](./ingress-nginx/nginx-ingress-controller.yaml)
+
+- it's set to monitor one namespace with the argument:  `--watch-namespace=kiamol-ch15-lab`
+
+- it uses a custom ingress class name: `--ingress-class=nginx-lab`          
+
+Deploy the app to the correct namespace:
+
+```
+kubectl apply -f lab/apod/ -n kiamol-ch15-lab
+```
+
+My Ingress specs for the [API](./solution/ingress-api.yaml) and the [website](./solution/ingress-web.yaml) specify the ingress class and the rate limit in annotations:
+
+```
+kubectl apply -f lab/solution/ -n kiamol-ch15-lab
+```
+
+Add the domain to your hosts file (use .sh script file on Linux/macOS):
+
+```
+./add-to-hosts.ps1 api.apod.local ingress-lab
+
+./add-to-hosts.ps1 web.apod.local ingress-lab
+```
+
+> Browse to http://www.apod.local/ and http://api.apod.local/image and you'll get responses
+
+> Refresh a lot and you'll get a 503 error:
+
+![503 from a rate-limiting ingress controller](./docs/503.png)
+
+## Teardown
+
+Remove the lab namespaces:
+
+```
+kubectl delete ns -l kiamol=ch15-lab
+```