Add Teamspeak 3 input plugin (#3315)

plugins/inputs/teamspeak/README.md

@@ -0,0 +1,45 @@
+# Teamspeak 3 Input Plugin
+
+This plugin uses the Teamspeak 3 ServerQuery interface of the Teamspeak server to collect statistics of one or more
+virtual servers. If you are querying an external Teamspeak server, make sure to add the host which is running Telegraf
+to query_ip_whitelist.txt in the Teamspeak Server directory. For information about how to configure the server take a look 
+the [Teamspeak 3 ServerQuery Manual](http://media.teamspeak.com/ts3_literature/TeamSpeak%203%20Server%20Query%20Manual.pdf)
+
+### Configuration:
+
+```
+# Reads metrics from a Teamspeak 3 Server via ServerQuery
+[[inputs.teamspeak]]
+  ## Server address for Teamspeak 3 ServerQuery
+  # server = "127.0.0.1:10011"
+  ## Username for ServerQuery
+  username = "serverqueryuser"
+  ## Password for ServerQuery
+  password = "secret"
+  ## Array of virtual servers
+  # virtual_servers = [1]
+```
+
+### Measurements:
+
+- teamspeak
+    - uptime
+    - clients_online
+    - total_ping
+    - total_packet_loss
+    - packets_sent_total
+    - packets_received_total
+    - bytes_sent_total
+    - bytes_received_total
+
+### Tags:
+
+- The following tags are used:
+    - virtual_server
+    - name
+
+### Example output:
+
+```
+teamspeak,virtual_server=1,name=LeopoldsServer,host=vm01 bytes_received_total=29638202639i,uptime=13567846i,total_ping=26.89,total_packet_loss=0,packets_sent_total=415821252i,packets_received_total=237069900i,bytes_sent_total=55309568252i,clients_online=11i 1507406561000000000
+```