Adds changelog, upgradig and introduction docs

Author: LordHepipud

README.md

@@ -22,3 +22,10 @@ $Script += "`r`n`r`n Start-IcingaFrameworkWizard;";
 
 Invoke-Command -ScriptBlock ([Scriptblock]::Create($Script));
 ```
+
+## Documentation
+
+Please take a look on the following content for installation and documentation:
+
+* [Introduction](doc/01-Introduction.md)
+* [Changelog](doc/31-Changelog.md)

doc/01-Introduction.md

@@ -0,0 +1,10 @@
+Introduction
+===
+
+The Icinga PowerShell Kickstart is a simple PowerShell script allowing users to easily install and deploy the [Icinga PowerShell Framwork](https://icinga.com/docs/windows/latest) on Windows machines by either using GitHub repositories or internal sources for the Zip-Package.
+
+Once the Framework is installed the entire installation of Icinga Agents including many different components is possible.
+
+The Kickstart script allows to specify a custom location for the script as well in case the Windows machines can not access the internet and only rely on internal resources.
+
+Please have a look on the [Installation Guide of the Framework](https://icinga.com/docs/windows/latest/doc/02-Installation/) on how to proceed.

doc/30-Upgrading-Kickstart.md

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+# Upgrading Icinga PowerShell Kickstart
+
+Upgrading Icinga PowerShell Kickstart is usually quite straightforward.
+
+Specific version upgrades are described below. Please note that version updates are incremental.
+
+## Upgrading to v1.1.0 (2020-06-02)
+
+No special steps required.
+
+## Upgrading to v1.0.0 (2020-02-26)
+
+Initial release.

doc/31-Changelog.md

@@ -0,0 +1,21 @@
+# Icinga PowerShell REST-Api CHANGELOG
+
+**The latest release announcements are available on [https://icinga.com/blog/](https://icinga.com/blog/).**
+
+Please read the [upgrading](https://icinga.com/docs/windows/latest/kickstart/doc/30-Upgrading-Kickstart)
+documentation before upgrading to a new release.
+
+Released closed milestones can be found on [GitHub](https://github.com/Icinga/icinga-powershell-kickstart/milestones?state=closed).
+
+## 1.1.0 (2020-06-02)
+
+### Enhancements
+
+* Updated asked questions to fit the current Icinga PowerShell Framework format
+* Improved visualisation for console prints to match the current Icinga PowerShell Framework version
+
+## 1.0.0 (2020-02-26)
+
+### Notes
+
+Initial release