include md in doc

Doxyfile.in

@@ -733,7 +733,7 @@ WARN_LOGFILE           =
 # spaces.
 # Note: If this tag is empty the current directory is searched.
 
-INPUT                  = "@CMAKE_CURRENT_SOURCE_DIR@/src/core"
+INPUT                  = "@CMAKE_CURRENT_SOURCE_DIR@/src/core" "@CMAKE_CURRENT_SOURCE_DIR@/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
@@ -753,7 +753,7 @@ INPUT_ENCODING         = UTF-8
 # *.md, *.mm, *.dox, *.py, *.f90, *.f, *.for, *.tcl, *.vhd, *.vhdl, *.ucf,
 # *.qsf, *.as and *.js.
 
-FILE_PATTERNS          = *.h
+FILE_PATTERNS          = *.h *.md
 
 # The RECURSIVE tag can be used to specify whether or not subdirectories should
 # be searched for input files as well.
@@ -768,7 +768,7 @@ RECURSIVE              = YES
 # Note that relative paths are relative to the directory from which doxygen is
 # run.
 
-EXCLUDE                = 
+EXCLUDE                =
 
 # The EXCLUDE_SYMLINKS tag can be used to select whether or not files or
 # directories that are symbolic links (a Unix file system feature) are excluded
@@ -869,7 +869,7 @@ 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
@@ -1000,7 +1000,7 @@ COLS_IN_ALPHA_INDEX    = 5
 # while generating the index headers.
 # This tag requires that the tag ALPHABETICAL_INDEX is set to YES.
 
-IGNORE_PREFIX          = 
+IGNORE_PREFIX          =
 
 #---------------------------------------------------------------------------
 # Configuration options related to the HTML output