started readme

readme.md

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+bandwidth
+=========
+
+`bandwidth` is a little package to be used in collecting and reporting on bandwidth numbers.
+
+It is intended to be used as such:
+
+
+```go
+    // report on 1, 10, 60 second intervals, update every 100 milliseconds
+	bw, _ := NewBandwidth([]int{1, 10, 60}, 100*time.Millisecond)
+	go bw.Run()
+	bw.AddRx <- 10
+	bw.AddTx <- 10
+	time.Sleep(1 * time.Second)
+	log.Printf("%+v", <-bw.Rx)
+    log.Printf("%+v", <-bw.Tx)
+```