EventLoaderEUDAQ2: update README, improved module description, in particular...

EventLoaderEUDAQ2: update README, improved module description, in particular pointing out the naming scheme for planes: <type>_<number>

src/modules/EventLoaderEUDAQ2/README.md

@@ -4,7 +4,25 @@
 **Status**: under development
 
 ### Description
-Correlate EUDAQ2 devices, based on time.
+This module allows data recorded by EUDAQ2 and stored in a EUDAQ2 binary file as raw detector data to be read into Corryvreckan.
+For each detector type, the corresponding converter module in EUDAQ2 is used to transform the data into the `StandardPlane` event type before storing the individual `Pixel` objects on the Corryvreckan clipboard.
+TLU event are not converted into `StandardEvents` but their timestamps can be used directly without conversion.
+
+The detectors need to be named according to the following scheme: `<detector_type>_<plane_number>` where `detector_type` is the type speciefied in the detectors file and `<plane_number>` is an iterative number over the planes of the same type.
+
+If the data of different detectors is stored in separate files, the parameters `name` or `type` can be used as shown in the usage example below.
+It should be noted that the order of the detectors is crucial.
+The first detector that appears in the configuration defines the event window to which the hits of all other detectors are compared.
+In the example below this is the CLICpix2.
+
+For each event, the algorithm checks for an event on the clipboard.
+If none is available, the current event defines the event on the clipboard.
+Otherwise, it is checked whether or not the current event lies within the clipboard event.
+If yes, the corresponding pixels are added to the clipboard for this event.
+If earlier, the next event is read until a matching event is found.
+If later, the pointer to this event is kept and it continues with the next detector.
+
+If no detector is capable of defining events, the `[Metronome]` modele needs to be used.
 
 ### Requirements
 This module requires an installation of [EUDAQ2](https://eudaq.github.io/). The installation path needs to be set to