Add README for disque input (influxdata#6208)

plugins/inputs/disque/README.md

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+# Disque Input
+
+[Disque](https://github.com/antirez/disque) is an ongoing experiment to build a distributed, in-memory, message broker.
+
+
+### Configuration:
+
+```toml
+[[inputs.disque]]  
+  ## An array of URI to gather stats about. Specify an ip or hostname
+  ## with optional port and password.
+  ## ie disque://localhost, disque://10.10.3.33:18832, 10.0.0.1:10000, etc.
+  ## If no servers are specified, then localhost is used as the host.
+  servers = ["localhost"]
+```
+
+### Metrics
+
+
+- disque
+  - disque_host
+    - uptime_in_seconds
+    - connected_clients
+    - blocked_clients
+    - used_memory
+    - used_memory_rss
+    - used_memory_peak
+    - total_connections_received
+    - total_commands_processed
+    - instantaneous_ops_per_sec
+    - latest_fork_usec
+    - mem_fragmentation_ratio
+    - used_cpu_sys
+    - used_cpu_user
+    - used_cpu_sys_children
+    - used_cpu_user_children
+    - registered_jobs
+    - registered_queues