Added basic documentation for Check-Commands

doc/02-Installation.md

@@ -43,7 +43,7 @@ This will create the base configuration of the module including the setup of dir
 Once completed successfully, you are ready to get started with using it. This will include
 
 * Using it localy with scripts
-* Integrate it with the Icinga 2 Agent
+* Integration into for the Icinga 2 Agent
 * Use it as Remote Execution target
 * Integrate it into Icinga Web 2
 
@@ -61,5 +61,6 @@ Of course if you wish to actively send data to Icinga Web 2 for example, you can
 
 For additional setup possibilities, please take a look on the following pages:
 
+* [Use the module as Icinga Plugin Framework](12-Icinga2AgentExample.md)
 * [Install the module as Windows Service](10-InstallService.md)
 * [Integration into Icinga Web 2](11-IcingaWeb2Integration.md)

doc/12-Icinga2AgentExample.md

@@ -0,0 +1,71 @@
+Icinga Agent integration as Framework Modules
+=====================================
+
+This PowerShell modules provides a wide range of Check-Plugins for Icinga 2 to fetch information from a Windows system. Once the module is installed, the Plugins are ready to use.
+
+Requirements
+--------------
+
+To properly work we recommend using the Icinga 2 Agent.
+
+Usage of the Check-Commands
+--------------
+
+Each call from the Icinga 2 Agent requires a short initialisation of the module. This can either be done by using the `Import-Module` Cmdlet in case the module is not autoloaded, or by calling
+
+```powershell
+Use-Icinga;
+```
+
+before each function call. An example on the PowerShell would be this:
+
+```
+Use-Icinga; Invoke-IcingaCheckCPU;
+```
+
+This will initialise the module and execute the Check-Command afterwards.
+
+Check-Command definition for Icinga
+--------------
+
+A example Check-Command for Icinga could look like this:
+
+```
+object CheckCommand "Windows Check CPU" {
+    import "plugin-check-command"
+    command = [
+        "C:\\Windows\\System32\\WindowsPowerShell\\v1.0\\powershell.exe"
+    ]
+    timeout = 3m
+    arguments += {
+        "-C" = {
+            order = 0
+            value = "Use-Icinga; exit Invoke-IcingaCheckCPU"
+        }
+        "-Critical" = {
+            order = 2
+            value = "$PowerShell_Critical$"
+        }
+        "-NoPerfData" = {
+            order = 6
+            set_if = "$PowerShell_NoPerfData$"
+        }
+        "-Verbose" = {
+            order = 4
+            value = "$PowerShell_Verbose$"
+        }
+        "-Warning" = {
+            order = 1
+            value = "$PowerShell_Warning$"
+        }
+    }
+    vars.PowerShell_Critical = "$$null"
+    vars.PowerShell_NoPerfData = "0"
+    vars.PowerShell_Verbose = "0"
+    vars.PowerShell_Warning = "$$null"
+}
+```
+
+This will call the PowerShell, execute the provided initialisation function `Use-Icinga` and afterwards execute the Check-Plugin with the provided arguments.
+
+Unlike other PowerShell integrations, it will automaticly exit with the proper exit code - no special handling is required here.