better packaging

- update readme

metrics.go

@@ -0,0 +1,23 @@
+package cachet
+
+import (
+	"encoding/json"
+	"strconv"
+)
+
+// SendMetric sends lag metric point
+func SendMetric(metricID int, delay int64) {
+	if metricID <= 0 {
+		return
+	}
+
+	jsonBytes, _ := json.Marshal(&map[string]interface{}{
+		"value": delay,
+	})
+
+	resp, _, err := makeRequest("POST", "/metrics/"+strconv.Itoa(metricID)+"/points", jsonBytes)
+	if err != nil || resp.StatusCode != 200 {
+		Logger.Printf("Could not log data point!\n%v\n", err)
+		return
+	}
+}