Merge branch 'readme' into 'master'

Readme

See merge request !13

README.md

 EICd - EIC data model               {#mainpage}
 =====================
 
-
 https://eic.phy.anl.gov/eicd
 
+- [dd4pod](https://eic.phy.anl.gov/npdet/namespacedd4pod.html): data model for dd4hep output which comes with [npdet](https://eic.phy.anl.gov/npdet/).
+
 
 ```
 cmake ../. -DCMAKE_INSTALL_PREFIX=$HOME/stow/eicd -DBUILD_DATA_MODEL=ON

docs/Doxyfile

@@ -791,7 +791,8 @@ WARN_LOGFILE           =
 # Note: If this tag is empty the current directory is searched.
 
 INPUT                  = src \
-                         eicd
+                         eicd \
+                         ../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