Updates README to include Linux as well

README.md

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+Infinity Engine Mod: Random rolls using RDRAND
+==============================================
+
+This mod aims to fix randomness of dice rolls in Enhanced Editions of Infinity
+Engine games. This includes BG:EE, BG2:EE (including EET), IWD:EE and PST:EE.
+
+This issue was discovered using Faydark's Autoroller (now part of
+[EE UI Tweaks](https://github.com/r-e-d/EEUITweaks)) where it takes just several
+minutes to notice odd results (repeating ability scores or same exceptional
+strength). It was discovered that the games are using plain rand() function
+from C library which is now deemed insufficient for any advanced use.
+
+The Autoroller makes this issue apparent as random numbers start to repeat, more
+notably on Windows platform. I believed that the games deserve better random
+number generator so I have decided to create this mod. Its form differs
+depending on a platform.
+
+Windows
+-------
+
+On Windows, it is the standard WeiDU mod that replaces original rand() function
+with RDRAND instruction.
+
+RDRAND is provided by CPU and its support was added in AMD Zen (2015) and Intel
+Ivy-Bridge (2012) processors. Therefore this mod will not work for owners of
+older processors. It was not my first choice but I had to fit the code in 33
+bytes that are available in PST:EE. Also, only Windows binaries patched to
+version 2.6 (for BG/BG2/EET/IWD) or version 3.1.3/3.1.4 (for PST) are currently
+supported.
+
+The mod consists of single component:
+  - Improve randomness of dice rolls:
+      Detects CPU support for RDRAND instruction and patches your game binary to
+      use it instead of rand().
+
+Linux
+-----
+
+There's no need for an actual mod in Linux. The package distributes a simple
+library _rand.so_ which can be preloaded to a game binary.
+
+E.g.: `LD_PRELOAD=rand.so ./BaldursGate`
+
+Version History:
+  - 1.1: Added Linux support
+  - 1.0: Initial release
+
+Author: Emanuel Komínek <[email protected]>