Added public files

Roughly added all public files. Probably missed some, though.
diff --git a/doc/props/P_KEEP_ON_SELL b/doc/props/P_KEEP_ON_SELL
new file mode 100644
index 0000000..8a21407
--- /dev/null
+++ b/doc/props/P_KEEP_ON_SELL
@@ -0,0 +1,8 @@
+NAME:
+    P_KEEP_ON_SELL                "keep_on_sell"                
+
+DEFINIERT IN:
+    /sys/properties.h
+
+BESCHREIBUNG:
+     Bei "verkaufe alles" wird das Objekt behalten.