Add debugging information to the README

README

@@ -1,5 +1,4 @@
-slack-timedate
-==============
+# slack-timedate
 
 This program implements timedated1 interface from systemd what is
 required by GNOME Control Center for now.
@@ -7,9 +6,34 @@ slack-timedate's purpose is to make it possible to enjoy full GNOME
 functionality on Slackware Linux which doesn't use systemd as its
 init-system.
 
+## Installation
 
-============
-Dependencies
-============
-glib
-dbus
+```
+cmake -B build \
+  -DCMAKE_INSTALL_PREFIX=/usr \
+  -DCMAKE_INSTALL_SYSCONFDIR=/etc
+make -C build
+make -C build install
+```
+
+The installation will create a file `build/install_manifest.txt`, which
+contains a list of all files installed in the system. To uninstall the
+application those should be removed, for example by doing:
+
+```
+xargs rm < build/install_manifest.txt
+```
+
+## Debugging
+
+Firstly an application is required that changes the time settings over the
+timedate1 service. It can be `gnome-control-center` or `kcmshell5 kcm_clock`
+for KDE.
+
+Then running `dbus-monitor --system` as root can be used to see the
+communication between the control center and this service.
+
+## Dependencies
+
+- glib
+- dbus