Added public files

Roughly added all public files. Probably missed some, though.
diff --git a/doc/props/P_TRAY b/doc/props/P_TRAY
new file mode 100644
index 0000000..34c9d90
--- /dev/null
+++ b/doc/props/P_TRAY
@@ -0,0 +1,8 @@
+NAME:
+    P_TRAY                        "tray"                        
+
+DEFINIERT IN:
+    /sys/properties.h
+
+BESCHREIBUNG:
+    *** KEINE BESCHREIBUNG VORHANDEN ***