renaming plugins -> inputs

plugins/outputs/amqp/README.md

@@ -0,0 +1,9 @@
+# AMQP Output Plugin
+
+This plugin writes to a AMQP exchange using tag, defined in configuration file
+as RoutingTag, as a routing key.
+
+If RoutingTag is empty, then empty routing key will be used.
+Metrics are grouped in batches by RoutingTag.
+
+This plugin doesn't bind exchange to a queue, so it should be done by consumer.