add alfred info

contrib/alfred.md

@@ -0,0 +1,21 @@
+# Start Master Server
+```
+alfred -i wlan0 -b none -m
+# -b batmanif to be used on router
+```
+
+# Save Data
+```
+# Note that 0 - 63 are reserved (please send an e-mail to the
+# authors if you want to register a datatype), and can not be used
+# on the commandline. Information must be periodically written
+# again to alfred, otherwise it will timeout and alfred will for-
+# get about it (after 10 minutes).
+cat r.xml | gzip | alfred -s 64
+```
+
+# Load Data
+```
+# 00:16:ea:c3:b8:26 is the mac of the sender
+alfred-json -z -f string -r 64 | python -c 'import sys,json;print(json.load(sys.stdin)["00:16:ea:c3:b8:26"])'
+```