Install the Boards Manager on your Arduino IDE. The Steps are provided at:
http://www.arduinesp.com/getting-started
Download (or git pull) the code and double click the file to run the program.
Compile and upload the code on Arduino IDE and see the output on Serial Monitor.
Copy the IP Address of your ESP8266 from Serial Monitor and paste it in your Web Browser to see the result on Web Server.
Note: Your system and ESP8266 should be connected to same Wi-Fi Network.