Add Opinion entity and add opinions on article

src/main/kotlin/fr/dcproject/entity/Opinion.kt

@@ -0,0 +1,14 @@
+package fr.dcproject.entity
+
+import fr.postgresjson.entity.immutable.*
+import java.util.*
+
+open class Opinion<T : TargetI>(
+    id: UUID = UUID.randomUUID(),
+    override val createdBy: CitizenBasic,
+    override var target: T,
+    var name: String
+) : ExtraI<T>,
+    UuidEntity(id),
+    EntityCreatedAt by EntityCreatedAtImp(),
+    EntityCreatedBy<CitizenBasicI> by EntityCreatedByImp(createdBy)