Add skeleton/first draft for developerguide: check package

Author: Crited

doc/developerguide/02-New-IcingaCheckPackage.md

@@ -0,0 +1,30 @@
+# Developer Guide: New-IcingaCheckPackage
+
+Below you will find a list of functions and detailed descriptions including use cases for Cmdlets and features the PowerShell Framework provides.
+
+| Type | Return Value | Description |
+| --- | --- | --- |
+| Cmdlet | PowerShell Object | Check Object containing other check objects |
+
+The `IcingaCheckPackage` is the first step to take to write more advanced checks. A `IcingaCheckPackage` offers the possibility to build a check containing varius `IcingaChecks`. Just like the `IcingaCheck`, the `IcingaCheckPackage` also provides a bunch of internal commands within the PowerShell Object to analyse a value and get the Icinga result `Ok`, `Warning`, `Critical` including performance metrics. In this case the result is based on the result of the logical connection between added `IcingaChecks` within the `IcingaCheckPackage`
+
+It will be used like in this example:
+
+
+```powershell
+$IcingaPackage = New-IcingaCheckPackage -Name 'My Package' -OperatorAnd;
+```
+
+## Arguments
+
+| Argument     | Input  | Mandatory | Description |
+| ---          | ---    | ---       | ---         |
+| Name         | String    |  *        | The unique name of each package within a plugin. Will be displayed in the check output.  |
+| OperatorAnd  | Switch    |           | Logical relation of the check within the package becomes an AND |
+| OperatorOr   | Switch    |           | Logical relation of the check within the package becomes an Or |
+| OperatorNone | Switch    |           | - |
+| OperatorMin  | Int       |           | - |
+| OperatorMax  | Int       |           | - |
+| Checks       | Array     |           | Array of checks to be added to the check package |
+| Verbose      | int       |           | Defines the level of output detail from 0 lowest to 3 highest detail |
+| Hidden       | Switch    |           | If set, the check package doesn't generate output |