Added guide for linux.

readme.linux.md

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+# Linux Compiling Guide #
+
+## Dependencies ##
+
+There is a good chance you can install these with your package manager.
+
+* Mono 
+* SFML and CSFML binding (http://www.sfml-dev.org/download.php)
+
+  The version of SFML and SFML.Net bindings should match. Else the mouse cursor can be stuck or other horrible things can happen.
+
+  The SFML.Net included in the sources currently is for SFML 2.2. If you have a different SFML version you can download the corresponding SFML.Net libraries from the project's homepage and replace the files in `Third-Party` (before compile) or `bin/Client` (after compile). For some reason SFML.Net 2.3 can't be downloaded from the homepage, you have to compile it yourself.
+
+## Compiling ##
+
+Just run
+```
+xbuild
+```
+in the root directory. The results will be in the `bin` directory.
+
+After compiling copy the `sfmlnet-*.dll.config` files to the bin/Client directory.
+```
+cp Third-Party/sfmlnet-*.dll.config bin/Client
+```
+
+## Run ##
+
+### Client ###
+```
+cd bin/Client
+mono SpaceStation14.exe
+```
+
+If you get errors similar to this:
+```
+Unhandled Exception:
+System.DllNotFoundException: csfml-graphics-2
+.
+.
+.
+```
+
+Then you either forgot to copy the `sfmlnet-*.dll.config` files after compiling or your csfml library is in a non-standard location. If the latter, adjust the `sfmlnet-*.dll.config` files to point to the right libraries.
+
+### Server ###
+```
+cd bin/Server
+mono SpaceStation14_Server.exe
+```