update readme.md for all samples

Signed-off-by: Anca Iordache <anca.iordache@docker.com>

samples/nginx-golang/README.md

@@ -0,0 +1,78 @@
+## Compose sample application
+### NGINX proxy with GO backend
+
+Project structure:
+```
+.
+├── backend
+│   ├── Dockerfile
+│   └── main.go
+├── docker-compose.yml
+├── frontend
+│   ├── Dockerfile
+│   └── nginx.conf
+└── README.md
+```
+
+[_docker-compose.yaml_](docker-compose.yaml)
+```
+version: "3.7"
+services:
+  frontend:
+    build: frontend
+    ports:
+    - 8080:80
+  backend:
+    build: backend
+```
+The compose file defines an application with two services `frontend` and `backend`.
+When deploying the application, docker-compose maps port 80 of the frontend service container to port 8080 of the host as specified in the file.
+Make sure port 8080 on the host is not already being in use.
+
+## Deploy with docker-compose
+
+```
+$ docker-compose up -d
+Creating network "nginx-golang_default" with the default driver
+Building backend
+Step 1/7 : FROM golang:1.13 AS build
+1.13: Pulling from library/golang
+...
+Successfully built 4b24f27138cc
+Successfully tagged nginx-golang_frontend:latest
+WARNING: Image for service frontend was built because it did not already exist. To rebuild this image you must use `docker-compose build` or `docker-compose up --build`.
+Creating nginx-golang_backend_1 ... done
+Creating nginx-golang_frontend_1 ... done
+```
+
+## Expected result
+
+Listing containers must show two containers running and the port mapping as below:
+```
+$ docker ps
+CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS                  NAMES
+8bd5b0d78e73        nginx-golang_frontend   "nginx -g 'daemon of…"   53 seconds ago      Up 52 seconds       0.0.0.0:8080->80/tcp   nginx-golang_frontend_1
+56f929c240a0        nginx-golang_backend    "/usr/local/bin/back…"   53 seconds ago      Up 53 seconds                              nginx-golang_backend_1
+```
+
+After the application starts, navigate to `http://localhost:8080` in your web browser or run:
+```
+$ curl localhost:8080
+
+          ##         .
+    ## ## ##        ==
+ ## ## ## ## ##    ===
+/"""""""""""""""""\___/ ===
+{                       /  ===-
+\______ O           __/
+ \    \         __/
+  \____\_______/
+
+	
+Hello from Docker!
+```
+
+Stop and remove the containers
+```
+$ docker-compose down
+```

samples/nginx-golang/backend/Dockerfile

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+FROM golang:1.13 AS build
+
+WORKDIR /compose/hello-docker
+COPY main.go main.go
+RUN CGO_ENABLED=0 go build -o backend main.go
+
+FROM scratch
+COPY --from=build /compose/hello-docker/backend /usr/local/bin/backend
+CMD ["/usr/local/bin/backend"]
+
+

samples/nginx-golang/backend/main.go

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+package main
+
+import (
+	"fmt"
+	"log"
+	"net/http"
+)
+
+func handler(w http.ResponseWriter, r *http.Request) {
+	fmt.Println(r.URL.RawQuery)
+	fmt.Fprintf(w, `
+          ##         .
+    ## ## ##        ==
+ ## ## ## ## ##    ===
+/"""""""""""""""""\___/ ===
+{                       /  ===-
+\______ O           __/
+ \    \         __/
+  \____\_______/
+
+	
+Hello from Docker!
+
+`)
+}
+
+func main() {
+	http.HandleFunc("/", handler)
+	log.Fatal(http.ListenAndServe(":80", nil))
+}

samples/nginx-golang/docker-compose.yml

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+
+version: "3.7"
+services:
+  frontend:
+    build: frontend    
+    ports:
+    - 8080:80
+    depends_on:
+    - backend
+  backend:
+    build: backend
+

samples/nginx-golang/frontend/Dockerfile

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+FROM nginx:alpine 
+COPY nginx.conf /etc/nginx/conf.d/default.conf
+
+

samples/nginx-golang/frontend/nginx.conf

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+server {
+  listen 80;
+  location / {
+    proxy_pass http://backend:80;
+  }
+}