Combine the README files

Author: carlbennett

README-Linux.txt

@@ -0,0 +1,26 @@
+# BNCSUtil
+
+## How to Compile
+
+### Windows
+The official build of BNCSUtil for Windows is produced using Visual Studio 2005
+using the solution file in the `vc8_build` folder. The `vc7_build` is no longer
+officially used or supported.
+
+BNCSUtil requires GMP.
+
+### Linux
+To build:
+```
+./configure
+make
+make install
+```
+
+If you have a fresh checkout or are having build-related issues, run the
+following to (re)generate the configure script:
+```
+autoreconf -if
+```
+
+Note that to use autoreconf you will need to have GNU autotools installed.