Writing User guide and use cases section.

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+Dictionary selection
+====================
+
+ArUco markers always belongs to a set of markers called ArUco markers dictionary.
+
+![ArUco dictionaries](../../img/aruco_dictionaries.png)
+
+Many ArUco dictionaries exist with properties concerning the format, the number of markers or the difference between each markers to avoid error in tracking.
+
+Here is the documention [about ArUco markers dictionaries](https://docs.opencv.org/3.4/d9/d6a/group__aruco.html#gac84398a9ed9dd01306592dd616c2c975).
+
+``` python
+from argaze.ArUcoMarkers import ArUcoMarkersDictionary
+
+# Create a dictionary of specific April tags
+aruco_dictionary = ArUcoMarkersDictionary.ArUcoMarkersDictionary('DICT_APRILTAG_16h5')
+```