Update the README with a tiny "How to use" section

README.md

 # WindBot
 
 A C# bot for ygopro, compatible with the ygosharp server.
+
+### How to use:
+
+* Code whatever you want to code in the `Program.cs` file.
+
+* Compile `WindBot.sln` using Visual Studio or Mono.
+
+* Put `cards.cdb` next to the compiled `WindBot.exe`.
+
+* Run and observe.