Update README

README.md

@@ -1,3 +1,12 @@
-# Contributing
+# Compiling
 
-`git clone https://bitbucket.org/worldbeater/camelotia`
+The app runs on Windows, Linux and MacOS. Make sure you have latest [.NET Core SDK](https://dot.net/) installed.
+
+```
+# Linux or MacOS shell
+git clone https://github.com/worldbeater/Camelotia
+cd Camelotia/Camelotia.Presentation.Avalonia
+dotnet run
+```
+
+On Windows, run the `./run.bat` file.