update readme

README.md

@@ -66,3 +66,8 @@ $ ./configure --enable-debug=yes
 $ make
 $ make check
 ```
+### Configure Options 
+* --enable-debug=(yes|no|verbose) - omit/include debug code
+* --enable-multithreading - enable pthreads (for examples/src/opcuaServerMT)
+* --enable-doxygen - make documentation as well
+* --enable-coverage - profiling with gcov,lcov, make check will generate reports in tests/coverage