fix(ADOPTERS.yaml): conform to official template

Replaced non-standard placeholder scaffold with the official
data-models templates/dataModel_for_submision/ADOPTERS.yaml format,
with [Data model]/[Subject] description placeholders filled in.

Author: albertoabellagarcia

EnergyCommunity/ADOPTERS.yaml

@@ -1,2 +1,10 @@
----
-name: []
+description: This is a compilation list of the current adopters of the data model EnergyCommunity of the Subject EnergyCommunity.  All fields are non mandatory. More info at https://smart-data-models.github.io/data-models/templates/dataModel/CURRENT_ADOPTERS.yaml
+currentAdopters:
+-
+ adopter: 
+ description: 
+ mail: 
+ organization: 
+ project: 
+ comments: 
+ startDate: 

EnergyProsumer/ADOPTERS.yaml

@@ -1,2 +1,10 @@
----
-name: []
+description: This is a compilation list of the current adopters of the data model EnergyProsumer of the Subject EnergyCommunity.  All fields are non mandatory. More info at https://smart-data-models.github.io/data-models/templates/dataModel/CURRENT_ADOPTERS.yaml
+currentAdopters:
+-
+ adopter: 
+ description: 
+ mail: 
+ organization: 
+ project: 
+ comments: 
+ startDate: