Added documentation

docs/output.txt

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+-----------------------------------
+  output API
+-----------------------------------
+
+The data we handle and output needs to be taken care of. We don't want to put
+any limitation for this within the core so we have designed a output API which
+allows us and others to easily develop "output drivers" which handles the data
+processing.
+
+The output drivers have complete access to the configuration file to allow them
+a way to get user defined input. Eg. database access information.
+
+At this time we only provide two different output drivers. One for mysql and
+one for stdout.
+
+-- functions
+
+output_init():
+
+    This function is called on startup and allows the output driver to initialize
+    stuff that is needed later on. Eg. loading configuration options and/or connecting
+    to the database.
+
+output_process():
+
+    Is called every time a new event is triggered. The event is passed to the function
+    and after that it is up to the driver to do some magic.
+
+output_error():
+
+    Converts error numbers to actual error strings. This function is used by the core
+    to display error messages from the output driver.
+
+output_exit():
+
+    Called when the program is exiting (For whatever reason). It allows you to clean up
+    your mess.