add apache-php7.2 sample

Signed-off-by: kouul <maulloohans@gmail.com>

apache-php/README.md

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+## Compose sample application
+### PHP application with Apache2
+
+Project structure:
+```
+.
+├── docker-compose.yaml
+├── app
+    ├── Dockerfile
+    └── index.php
+
+```
+
+[_docker-compose.yaml_](docker-compose.yaml)
+```
+services:
+  web:
+    build: app
+    ports: 
+      - '8008:80'
+    volumes:
+      - ./app:/var/www/html/
+```
+
+## Deploy with docker-compose
+
+```
+$ docker-compose up -d
+Creating network "php-docker_web" with the default driver
+Building web
+Step 1/6 : FROM php:7.2-apache
+...
+...
+Creating php-docker_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
+2bc8271fee81        php-docker_web               "docker-php-entrypoi…"   About a minute ago  Up About a minute   0.0.0.0:8008->80/tc    php-docker_web_1
+```
+
+After the application starts, navigate to `http://localhost:8008` in your web browser or run:
+```
+$ curl localhost:8008
+Hello World!
+```
+
+Stop and remove the containers
+```
+$ docker-compose down
+```

apache-php/app/Dockerfile

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+FROM php:7.2-apache

apache-php/app/index.php

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+<?php
+    echo'Hello World!';
+?>

apache-php/docker-compose.yml

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+version: "3.7"
+services:
+  web:
+    build: app
+    ports: 
+      - '8008:80'
+    volumes:
+      - ./app:/var/www/html/