5419 update check packages2install

... and create docs subfolder

docs/20_Checks/check_cpu.md

-# IML Checks for Icinga / Nagios
+# check CPU
 
-[Home](readme.md)
-
----
-
-## check CPU
-
-### Introduction
+## Introduction
 
 **check_cpu** is a plugin to check cpu usage and cpu io wait.
 It reads cpu data from output of top command and shows
@@ -26,11 +20,11 @@ For all values it sends performance data.
 
 If there are processes with status D they will be shown (to analyze cpu waits).
 
-### Syntax
+## Syntax
 
 ``$ check_NAME [-c CRITICAL] [-w WARING] [-i CRITICAL_IO]``
 
-#### Parameters
+### Parameters
 
 ```text
     -w VALUE       cpu usage warning level  (default: 75)
@@ -42,7 +36,7 @@ If there are processes with status D they will be shown (to analyze cpu waits).
 
 ```
 
-# Examples
+## Examples
 
 ``check_cpu -w 60 -c 80 -i 40``
     check cpu usage.