update docs: add embed infos

docs/30_Usage.md

 ## Show help
 
 ```text
-./src/amcli -h
+./amcli -h
 IML Appmonitor as CLI client 0.2
 
 This client performs appmonitor checks and puts the results as JSON to stdout.

docs/40_Embed.md

+## Introduction
+
+To embed the cli tool into your web application you need to
+
+* perform the execution of the binary with referencing the ini `<PATH>amcli --ini=<INI-FILE>`
+* catch exitcode and output of STDOUT
+* check returncode: 
+  * if it is `0` then the excution was successful - we have a result. You can send the JSON after setting the content type as http response header
+  * if it is `> 0` the response is no JSON syntax. You should send the output that the error is seen in the appm nitor server.
+
+## PHP
+
+This code snippet is for demonstration purposes only. A PHP web app should use the PHP client - see <https://os-docs.iml.unibe.ch/appmonitor/PHP_client/index.html>
+
+```php
+<?php
+
+$AMCLI=__DIR__.'/../built_packages/amcli';
+$INI=__DIR__.'/../src/simple.ini';
+
+$sCommand="$AMCLI --ini='$INI'";
+$aOut=[];
+
+exec($sCommand, $aOut, $iRc);
+
+if($iRc==0){
+    header('Content-type: application/json');
+}else{
+    echo "Error: occured...\n";
+}
+echo implode("\n", $aOut);
+```

docs/40_Build.md → docs/50_Build.md

 ## Requirements
 
-To update and test the command line tool you need 
+To update and test the command line tool you need
 
 * git
 * a local PHP8 cli.
 
-## Prepare environemnt
+## Prepare environment
 
 ### Get sources
 
@@ -22,6 +22,8 @@ You get this initial structure:
 ```txt
 .
 ├── build.php
+├── examples
+    └── embed_example.php
 ├── inc_functions.php
 ├── inc_vars.php
 ├── installer.php