Update readme

Create a link to the issues.

README.md

@@ -1,8 +1,23 @@
 # Getting started
 
-## launch tomcat server
+The purpose of this Proof Of Concept is to demonstrate how it is possible to use the CVE-2017-12617
+in order to have a remote control on an Apache Tomcat server.
+
+## Instructions
+
+1. Please execute this command to run the server.
 
 `make server_up`
 
-## launch attack(need cURL)
-`make attack`
+2. Execute this command to run the attack and upload a web shell on the server (need cURL).
+
+`make attack`
+
+> If this command don't open your navigator, you could go to :
+`http://localhost:8080/web_shell.jsp?cmd=pwd`
+
+You will now have access to a web shell on the server, directly in your browser.
+
+## Questions
+
+If you have any problems to run this Proof of Concept, please create an issue at : https://github.com/ygouzerh/CVE-2017-12617/issue , we will do our best to answer you as quickly as possible.