Adding myself to the MAINTAINERS file.

Docker-DCO-1.1-Signed-off-by: O.S. Tezer <ostezer@gmail.com> (github: ostezer)

docs/MAINTAINERS

@@ -1,2 +1,3 @@
 James Turnbull <james@lovedthanlost.net> (@jamtur01)
 Sven Dowideit <SvenDowideit@fosiki.com> (@SvenDowideit)
+O.S. Tezer <ostezer@gmail.com> (@OSTezer)