add logging category KDECONNECT_INDICATOR to indicator

indicator/CMakeLists.txt

 add_definitions(-DTRANSLATION_DOMAIN=\"kdeconnect-indicator\")
 
+set(debug_file_SRCS)
+ecm_qt_declare_logging_category(
+    debug_file_SRCS HEADER indicator_debug.h
+    IDENTIFIER KDECONNECT_INDICATOR CATEGORY_NAME kdeconnect.indicator
+    DEFAULT_SEVERITY Warning
+    EXPORT kdeconnect-kde DESCRIPTION "kdeconnect (indicator)")
+
 set(indicator_SRCS
     main.cpp
     deviceindicator.cpp
@@ -18,7 +25,8 @@ else ()
     list(APPEND indicator_SRCS indicatorhelper.cpp)
 endif()
 
-add_executable(kdeconnect-indicator ${indicator_SRCS})
+add_executable(kdeconnect-indicator ${indicator_SRCS} ${debug_file_SRCS})
+
 target_link_libraries(kdeconnect-indicator Qt5::Widgets KF5::CoreAddons KF5::I18n KF5::Notifications KF5::DBusAddons KF5::KCMUtils kdeconnectinterfaces kdeconnectcore kdeconnectversion)
 if (WIN32)
     add_compile_definitions(QSYSTRAY)