Update README for sinks and rename file

sinks/README.md

@@ -1,10 +1,9 @@
 This folder contains the sinks for the cc-metric-collector.
 
-# `sink.go`
-The base class/configuration is located in `sink.go`.
+# `metricSink.go`
+The base class/configuration is located in `metricSink.go`.
 
 # Sinks
-There are currently two sinks shipped with the cc-metric-collector:
 * `stdoutSink.go`: Writes all metrics to `stdout` in InfluxDB line protocol. The sink does not use https://github.com/influxdata/line-protocol to reduce the executed code for debugging
 * `influxSink.go`: Writes all metrics to an InfluxDB database instance using a blocking writer. It uses https://github.com/influxdata/influxdb-client-go . Configuration for the server, port, user, password and database name are in the global configuration file
 * `natsSink.go`: Sends all metrics to an NATS server using the InfluxDB line protocol as encoding. It uses https://github.com/nats-io/nats.go . Configuration for the server, port, user, password and database name are in the global configuration file. The database name is used as subject for the NATS messages.
@@ -13,8 +12,8 @@ There are currently two sinks shipped with the cc-metric-collector:
 Nothing to do, all sinks are pure Go code
 
 # Contributing own sinks
-A sink contains three functions and is derived from the type `Sink` (in `sink.go`):
-* `Init(host string, port string, user string, password string, database string) error`
+A sink contains three functions and is derived from the type `Sink` (in `metricSink.go`):
+* `Init(config SinkConfig) error`
 * `Write(measurement string, tags map[string]string, fields map[string]interface{}, t time.Time) error`
 * `Close()`