CMakeLists.txt placeholder with directions on where to find boost-cmake

[SVN r56943]

CMakeLists.txt

@@ -0,0 +1,12 @@
+message(SEND_ERROR "
+Boost *IS* buildable with cmake, however this is
+distributed separately.
+
+See the boost-cmake wiki:
+
+   https://svn.boost.org/trac/boost/wiki/CMake
+
+For the location of CMakeable distributions.
+"
+)
+