add selenium

selenium/README.md

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+selenium
+========
+
+[Selenium][1] is an umbrella project for a range of tools and libraries that enable
+and support the automation of web browsers.
+
+## Server
+
+docker-compose.yml
+
+```
+firefox:
+  image: selenium/standalone-firefox
+  ports:
+    - "4444:4444"
+  environment:
+    - JAVA_OPTS=-Xmx512m
+  restart: always
+```
+
+```
+$ docker-compose up -d
+```
+
+## Client
+
+demo.py
+
+```
+#!/usr/bin/env python3
+
+from selenium import webdriver
+from selenium.webdriver.common.desired_capabilities import DesiredCapabilities
+
+driver = webdriver.Remote(
+    command_executor='http://127.0.0.1:4444/wd/hub',
+    desired_capabilities=DesiredCapabilities.FIREFOX
+)
+
+driver.get('https://github.com/SeleniumHQ/docker-selenium')
+driver.save_screenshot('before-click.png')
+driver.find_element_by_css_selector('.author>a').click()
+driver.save_screenshot('after-click.png')
+```
+
+```
+$ pip3 install selenium
+$ python3 demo.py
+$ ls *.png
+```
+
+[1]: http://seleniumhq.org/

selenium/docker-compose.yml

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+firefox:
+  image: selenium/standalone-firefox
+  ports:
+    - "4444:4444"
+  environment:
+    - JAVA_OPTS=-Xmx512m
+  restart: always