Add the pool model to the build system

src/CMakeLists.txt

@@ -4,6 +4,7 @@ set(danbooru_client_SRCS
     danbooruconnectwidget.cpp
     model/danboorupostdelegate.cpp
     model/danboorupostmodel.cpp
+    model/danboorupoolmodel.cpp
     generalpage.cpp
     mainwindow.cpp
     danbooru_client.cpp