Added missing files and build instructions

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+Doxygen uses cmake (http://www.cmake.org/) to build executables for various platforms.
+
+The first step is to create a build directory where the output should be stored.
+Doxygen directory can be fully build outside of the source tree.
+
+The second step is to invoke cmake from within the build directory with the desired generator.
+
+For Linux/Unix systems do the following
+
+  mkdir build
+  cd build
+  cmake -G "Unix Makefiles" path/to/root/of/doxygen/source/tree
+  make
+
+This also works for MacOSX, but if XCode is installed you can also generate an XCode project file
+
+  cmake -G XCode path/to/root/of/doxygen/source/tree
+
+For Windows one can generate a Visual Studio project using
+
+  cmake -G "Visual Studio 12 2013" path\to\root\of\doxygen\source\tree
+
+(this is for Visual Studio 12, there are typically also generators for other versions of
+Visual Studio or other compiler environments like MinGW)
+
+Doxygen's cmake configuration provides a number of options:
+- build_wizard    Build the GUI frontend for doxygen.
+- build_app       Example showing how to embed doxygen in an application.
+- build_xmlparser Example showing how to parse doxygen's XML output.
+- build_search    Build external search tools (doxysearch and doxyindexer)
+- build_doc       Build user manual
+- use_sqlite3     Add support for sqlite3 output [experimental].
+- use_libclang    Add support for libclang parsing.
+- win_static      Link with /MT in stead of /MD on windows
+
+An option can be turned on, by adding -D<option>=ON as a command line option, this can be
+done when generating the initial build files, but also afterwards, i.e. to enable building
+of the documentation after an initial cmake -G run, do
+
+  cmake -Dbuild_doc=ON path/to/root/of/doxygen/source/tree
+
+To turn the option off use
+
+  cmake -Dbuild_doc=OFF path/to/root/of/doxygen/source/tree
+
+To see the current value is of the various options, you can run
+
+  cmake -L path/to/root/of/doxygen/source/tree
+
+The build target for building the documentation is 'doc' and the build target for
+the regression tests is 'tests'