Update readme, include "users" info as suggested in issue #24.

README

@@ -1,26 +1,36 @@
 libcpuid
----------
+========
 
 libcpuid provides CPU identification for the x86 (and x86_64).
 For details about the programming API, please see the docs
 on the project's site (http://libcpuid.sourceforge.net/)
 
-    Configuring after checkout
-    --------------------------
+Configuring after checkout
+--------------------------
 
-        Under linux, where you download the sources, there's no
-    configure script to run. This is because it isn't a good practice to keep
-    such scripts in a source control system. To create it, you need to run the
-    following commands once, after you checkout the libcpuid sources
-    from github:
+Under linux, where you download the sources, there's no
+configure script to run. This is because it isn't a good practice to keep
+such scripts in a source control system. To create it, you need to run the
+following commands once, after you checkout the libcpuid sources
+from github:
 
         1. run "libtoolize"
         2. run "autoreconf --install"
 
-        You need to have autoconf, automake and libtool installed.
+You need to have `autoconf`, `automake` and `libtool` installed.
 
-        After that you can run "./configure" and "make" - this will build
-    the library.
+After that you can run `./configure` and `make` - this will build
+the library.
 
-        "make dist" will create a tarball (with "configure" inside) with the
-    sources.
+`make dist` will create a tarball (with "configure" inside) with the
+sources.
+
+Users
+-----
+
+So far, I'm aware of the following projects which utilize libcpuid:
+
+* CPU-X (https://github.com/X0rg/CPU-X)
+* fre:ac (https://www.freac.org/)
+
+We'd love to hear from you if you are also using libcpuid and want your project listed above.