Added description of production mode

Documentation/Books/Users/Foxx/Production/Productionmode.mdpp

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+!CHAPTER Application Production Mode
+
+This chapter describes the production mode for Foxx applications.
+This is the default mode for all newly installed apps and should always be used in a production environment.
+
+!SECTION Activation
+
+Activating the production mode is done with a single command:
+
+    unix> foxx-manager production /example
+    Activated production mode for Application hello-foxx version 1.5.0 on mount point /example
+
+Now the app will not be listed in *listDevelopment*:
+
+    unix> foxx-manager listDevelopment
+    Mount       Name          Author          Description                                 Version    Development
+    ---------   -----------   -------------   -----------------------------------------   --------   ------------
+    ---------   -----------   -------------   -----------------------------------------   --------   ------------
+    0 application(s) found
+
+!SECTION Effects
+
+For a Foxx application in production mode the following effects apply:
+<dl>
+  <dt>Application Caching</dt>
+  <dl>
+    The first time an application is requested it's routing is computed and cached.
+    It is guaranteed that subsequent requests to this application will get the cached routing.
+    That implies that changing the sources of an app will not have any effect.
+    It also guarantees that requests will be answered at the highest possible speed.
+    The cache might be flushed whenever ArangoDB is restarted or an application in development mode is requested.
+  </dl>
+  <dt>Only internal Debugging information</dt>
+  <dl>
+    Whenever the application is requested and an unhandled error occurs only a generic error message will be returned.
+    Stack traces are never delivered via the public API.
+    For more information see the [Debugging](Debugging.md) section.
+  </dl>
+</dl>
+