Add skaffold install and guide

skaffold/README.md

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+# Install Skaffold
+
+```shell
+curl -Lo skaffold https://storage.googleapis.com/skaffold/releases/latest/skaffold-linux-amd64 && \
+sudo install skaffold /usr/local/bin/
+```

skaffold/starter/Dockerfile

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+FROM golang:1.15 as builder
+COPY main.go .
+# `skaffold debug` sets SKAFFOLD_GO_GCFLAGS to disable compiler optimizations
+ARG SKAFFOLD_GO_GCFLAGS
+RUN go build -gcflags="${SKAFFOLD_GO_GCFLAGS}" -o /app main.go
+
+FROM alpine:3
+# Define GOTRACEBACK to mark this container as using the Go language runtime
+# for `skaffold debug` (https://skaffold.dev/docs/workflows/debug/).
+ENV GOTRACEBACK=single
+CMD ["./app"]
+COPY --from=builder /app .

skaffold/starter/k8s-pod.yaml

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+apiVersion: v1
+kind: Pod
+metadata:
+  name: getting-started
+spec:
+  containers:
+  - name: getting-started
+    image: skaffold-example

skaffold/starter/main.go

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+package main
+
+import (
+	"fmt"
+	"time"
+)
+
+func main() {
+	for {
+		fmt.Println("Hello world!")
+
+		time.Sleep(time.Second * 1)
+	}
+}

skaffold/starter/skaffold.yaml

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+apiVersion: skaffold/v2beta24
+kind: Config
+build:
+  artifacts:
+    - image: skaffold-example
+deploy:
+  kubectl:
+    manifests:
+      - k8s-*