Updating readme for Raw and Average message types

README.md

@@ -40,6 +40,20 @@ Sampling
 
 Tells StatsD that this counter is being sent sampled every 1/10th of the time.
 
+Averaging
+--------
+
+    load_5min:2.3|a
+
+Tells StatsD that the "load" average keys should be averaged before being reported.
+
+Raw Data
+--------
+
+    population:45344|r
+
+Will buffer a set of commands to send to carbon without any preprocessing. (As the major point of StatsD is to serve as an aggregator, be careful with this metric. Try to use counts, timers, and averages when you can instead of pushing lots of raw data to carbon. However, to keep reporting interfaces consistent, this is useful.)
+
 
 Guts
 ----