update docs

Frontend/README.md

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+# Frontend
+
+The Frontend is called from `index.php`.
+
+The Frontend uses the Modules, Services and Clients.
+
+The Frontend provides the page.

Module/README.md

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+# Module
+
+The Module includes the class and functions.
+
+The Module should run without a system.
+
+The Module must not do anything by executing as php.
+
+The Modules can include and use other modules.
+
+If system configuration is required, the Module can load the configuration script `ContentsPlanet.php`.

Service/README.md

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+# Service
+
+The Service executes the predefined tasks when accessed externally.
+In many cases, it will be accessed via the POST method.
+
+The Service can use the Modules.
+
+The Service should run without a system (not as much as a module).
+
+As with the modules, if system configuration is required, the Service can load the configuration script `ContentsPlanet.php`.