Update README.md

README.md

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 # PCF-Controls
 Controls using PowerApps Components Framework
+
+## NN Checkboxes
+### Purpose
+The purpose of this control is to allow user to associate/disassociate records for a many-to-many relationship displaying all possible records as checkboxes.
+
+![Vidéo](https://github.com/MscrmTools/PCF-Controls/blob/master/NNCheckboxes/Screenshots/video.gif?raw=true)
+
+### Configuration
+![Configuration](https://github.com/MscrmTools/PCF-Controls/blob/master/NNCheckboxes/Screenshots/Configuration.png?raw=true)
+
+Due to current limitation of PowerApps Components Framework for dataset, multiple properties need to be set
+1. Display attribute (Champ d'affichage) : Attribute in the subgrid view that is used for checkbox label
+2. Parent entity logical name (Nom logique de l'entité parente) : Logical name of the current form entity 
+3. Relationship schema name (Nom de schéma de la relation) : Schema name (case is important) of the many-to-many relationship