Update changelog and add basic nsq input readme

plugins/inputs/nsq/README.md

@@ -0,0 +1,17 @@
+# NSQ Input Plugin
+
+### Configuration:
+
+```toml
+# Description
+[[inputs.nsq]]
+  ## An array of NSQD HTTP API endpoints
+  endpoints  = ["http://localhost:4151"]
+
+  ## Optional TLS Config
+  # tls_ca = "/etc/telegraf/ca.pem"
+  # tls_cert = "/etc/telegraf/cert.pem"
+  # tls_key = "/etc/telegraf/key.pem"
+  ## Use TLS but skip chain & host verification
+  # insecure_skip_verify = false
+```