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

learn/learn-kubernetes-master/kiamol/ch21/functions/todo-api/ingress/ingress.yaml

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+apiVersion: networking.k8s.io/v1beta1 
+kind: Ingress
+metadata:
+  name: todo-api
+  labels:
+    kiamol: ch21
+spec:
+  rules:
+  - host: api.todo.kiamol.local
+    http:
+      paths:
+      - path: /todos
+        backend:
+          serviceName: todo-api
+          servicePort: 8080
+
+# this spec is equivalent to running 
+# kubeless trigger http create todo-api --function-name todo-api --path todos --hostname api.todo.kiamol.local
+# but that fails with Kubeless 1.0.7 running on Kubernetes 1.18 - see
+# https://github.com/kubeless/kubeless/issues/1130

learn/learn-kubernetes-master/kiamol/ch21/functions/todo-api/package.json

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+{
+    "name": "todo-api",
+    "version": "0.1.0",
+    "main": "server.js",
+    "author": "kiamol",
+    "dependencies": {
+      "nats" : "1.4.9",
+      "uuid" : "8.2.0"
+    }
+}
+  

learn/learn-kubernetes-master/kiamol/ch21/functions/todo-api/server.js

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+const NATS = require('nats')
+const nc = NATS.connect({url: 'nats://message-queue:4222', json: true})
+const { v4: uuidv4 } = require('uuid');
+
+function handler(event, context) {
+  console.log('** todo-api handler called');
+  
+  var newItemEvent = {
+    Subject: "events.todo.newitem",
+    Item: {
+      Item: event.data,
+      DateAdded: new Date().toISOString()
+    },
+    CorrelationId: uuidv4()
+  }
+
+  nc.publish('events.todo.newitem', newItemEvent)
+  console.log(`** New item published, event ID: ${newItemEvent.CorrelationId}`);
+}
+
+module.exports = { handler }