Added public files

Roughly added all public files. Probably missed some, though.
diff --git a/doc/props/P_ITEMS b/doc/props/P_ITEMS
new file mode 100644
index 0000000..add4255
--- /dev/null
+++ b/doc/props/P_ITEMS
@@ -0,0 +1,9 @@
+NAME:
+    P_ITEMS                       "items"                       
+
+DEFINIERT IN:
+    /sys/properties.h
+
+BESCHREIBUNG:
+     Definition von Gegenstaenden, die in dem Raum liegen sollen.
+     Erklaerung in einem Extrafile.