Add the new directories and files for v528 release notes.

bindings/doc/v528/index.html

cint/doc/v528/index.html

core/doc/v528/index.html

doc/v528/Trailer.html

doc/v528/index.html

geom/doc/v528/index.html

graf2d/doc/v528/index.html

graf3d/doc/v528/index.html

gui/doc/v528/index.html

hist/doc/v528/index.html

html/doc/v528/index.html

io/doc/v528/index.html

math/doc/v528/index.html

misc/doc/v528/index.html

montecarlo/doc/v528/index.html

net/doc/v528/index.html

proof/doc/v528/index.html

roofit/doc/v528/index.html

sql/doc/v528/index.html

tmva/doc/v528/index.html