added README with info about doxygen stuff

diff --git a/doc/devel/README b/doc/devel/README
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index 0000000..aae3daf
--- /dev/null
+++ b/doc/devel/README
@@ -0,0 +1,5 @@
+This is a folder with content for Doxygen.
+This is used by developers and is not used directly in official builds.
+
+To build doxygen documetation run:
+make devel
\ No newline at end of file