Django example (#43)

Add a Django example

django/README.md

@@ -0,0 +1,52 @@
+## Compose sample application
+### Django application in dev mode
+
+Project structure:
+```
+.
+├── docker-compose.yaml
+├── app
+    ├── Dockerfile
+    ├── requirements.txt
+    └── manage.py
+
+```
+
+[_docker-compose.yaml_](docker-compose.yaml)
+```
+services: 
+  web: 
+    build: app 
+    ports: 
+      - '8000:8000'
+```
+
+## Deploy with docker-compose
+
+```
+$ docker-compose up -d
+Creating network "django_default" with the default driver
+Building web
+Step 1/6 : FROM python:3.7-alpine
+...
+...
+Status: Downloaded newer image for python:3.7-alpine
+Creating django_web_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
+3adaea94142d        django_web          "python3 manage.py r…"   About a minute ago   Up About a minute   0.0.0.0:8000->8000/tcp   django_web_1
+```
+
+After the application starts, navigate to `http://localhost:8000` in your web browser:
+
+Stop and remove the containers
+```
+$ docker-compose down
+```