update some examples

Former-commit-id: 2ed7c323dd379eb68d5ccb2044cd9cc772ce0b08

_examples/tutorial/docker/.dockerignore

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+.git
+node_modules
+bin

_examples/tutorial/docker/Dockerfile

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+# docker build -t myapp . 
+# docker run --rm -it -p 8080:8080 myapp:latest
+FROM golang:latest AS builder
+RUN apt-get update
+ENV GO111MODULE=on \
+    CGO_ENABLED=0 \
+    GOOS=linux \
+    GOARCH=amd64
+WORKDIR /go/src/app
+COPY go.mod .
+RUN go mod download
+COPY . .
+RUN go install
+
+FROM scratch
+COPY --from=builder /go/bin/app .
+ENTRYPOINT ["./app"]

_examples/tutorial/docker/README.md

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+# Docker Example
+
+The only requirement for this example is [Docker](https://docs.docker.com/install/).
+
+## Docker Compose
+
+The Docker Compose is pre-installed with Docker for Windows. For linux please follow the steps described at: https://docs.docker.com/compose/install/.
+
+Build and run the application for linux arch and expose it on http://localhost:8080.
+
+```sh
+$ docker-compose up
+```
+
+See [docker-compose file](docker-compose.yml).
+
+## Without Docker Compose
+
+1. Build the image as "myapp" (docker build)
+2. Run the image and map exposed ports (-p 8080:8080)
+3. Attach the interactive mode so CTRL/CMD+C signals are respected to shutdown the Iris Server (-it)
+4. Cleanup the image on finish (--rm)
+
+```sh
+$ docker build -t myapp . 
+$ docker run --rm -it -p 8080:8080 myapp:latest
+```

_examples/tutorial/docker/docker-compose.yml

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+# docker-compose up [--build]
+version: '3'
+
+services:
+  app:
+    build: .
+    ports:
+      - 8080:8080

_examples/tutorial/docker/go.mod

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+module app
+
+go 1.14
+
+require (
+	github.com/kataras/iris/v12 v12.2.0
+)

_examples/tutorial/docker/main.go

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+package main
+
+import (
+	"flag"
+
+	"github.com/kataras/iris/v12"
+)
+
+var addr = flag.String("addr", ":8080", "host:port to listen on")
+
+// $ docker-compose up
+func main() {
+	flag.Parse()
+
+	app := iris.New()
+
+	app.Get("/", func(ctx iris.Context) {
+		ctx.HTML("<strong>Hello World!</strong>")
+	})
+
+	app.Get("/api/values/{id:uint}", func(ctx iris.Context) {
+		ctx.Writef("id: %d", ctx.Params().GetUintDefault("id", 0))
+	})
+
+	app.Listen(*addr)
+}