Use README.md as doxygen's main page.

Author: andleb

README.md

@@ -35,6 +35,7 @@ NOTE: I have stayed away from *C*-like input/output parameters and have replaced
 [*common*](https://github.com/andleb/common) repository for utility classes & functions.
 
 The project is built via *CMake*. One can, of course, modify the *CMake* configuration at will or use one's own.
+The documentation is to be built with *Doxygen* from the provided *doxyfile*.
 
 
 ## Authors

doxyfile

@@ -791,7 +791,8 @@ WARN_LOGFILE           =
 # Note: If this tag is empty the current directory is searched.
 
 INPUT                  = mains \
-                         src
+                         src \
+                         README.md
 
 # This tag can be used to specify the character encoding of the source files
 # that doxygen parses. Internally doxygen uses the UTF-8 encoding. Doxygen uses
@@ -983,7 +984,7 @@ FILTER_SOURCE_PATTERNS =
 # (index.html). This can be useful if you have a project on for instance GitHub
 # and want to reuse the introduction page also for the doxygen output.
 
-USE_MDFILE_AS_MAINPAGE = 
+USE_MDFILE_AS_MAINPAGE = README.md
 
 #---------------------------------------------------------------------------
 # Configuration options related to source browsing