reorganization of _examples and add some new examples such as iris+groupcache+mysql+docker

Former-commit-id: ed635ee95de7160cde11eaabc0c1dcb0e460a620

_examples/webassembly/main.go

@@ -0,0 +1,28 @@
+package main
+
+import (
+	"github.com/kataras/iris/v12"
+)
+
+/*
+You need to build the hello.wasm first, download the go1.14 and execute the below command:
+$ cd client && GOARCH=wasm GOOS=js /home/$yourname/go1.14/bin/go build -o hello.wasm hello_go114.go
+*/
+
+func main() {
+	app := iris.New()
+
+	// we could serve your assets like this the sake of the example,
+	// never include the .go files there in production.
+	app.HandleDir("/", "./client")
+
+	app.Get("/", func(ctx iris.Context) {
+		// ctx.Gzip(true)
+		ctx.ServeFile("./client/hello.html")
+	})
+
+	// visit http://localhost:8080
+	// you should get an html output like this:
+	// Hello, the current time is: 2018-07-09 05:54:12.564 +0000 UTC m=+0.003900161
+	app.Listen(":8080")
+}