Collector documentation (#113)

* Initial draft of collector documentation

* Add docs for all collectors

* Update main README with links to docs

* Fix link syntax

docs/collector.cs.md

@@ -0,0 +1,27 @@
+# cs collector
+
+The cs collector exposes metrics detailing the hardware of the computer system
+
+Metric name prefix | `cs`
+Classes             | [`Win32_ComputerSystem`](https://msdn.microsoft.com/en-us/library/aa394102)
+Enabled by default? | Yes
+
+## Flags
+
+None
+
+## Metrics
+
+Name | Description | Type | Labels
+-----|-------------|------|-------
+`wmi_cs_logical_processors` | Number of installed logical processors | gauge | None
+`wmi_cs_physical_memory_bytes` | Total installed physical memory | gauge | None
+
+### Example metric
+_This collector does not yet have explained examples, we would appreciate your help adding them!_
+
+## Useful queries
+_This collector does not yet have any useful queries added, we would appreciate your help adding them!_
+
+## Alerting examples
+_This collector does not yet have alerting examples, we would appreciate your help adding them!_