feat(comp): add more register data

src/main/java/fr/titionfire/ffsaf/data/id/RegisterId.java

@@ -0,0 +1,20 @@
+package fr.titionfire.ffsaf.data.id;
+
+import fr.titionfire.ffsaf.data.model.CompetitionModel;
+import fr.titionfire.ffsaf.data.model.MembreModel;
+import jakarta.persistence.JoinColumn;
+import jakarta.persistence.ManyToOne;
+import lombok.Data;
+
+import java.io.Serializable;
+
+@Data
+public class RegisterId implements Serializable {
+    @ManyToOne
+    @JoinColumn(name = "id_competition")
+    private CompetitionModel competition;
+
+    @ManyToOne
+    @JoinColumn(name = "id_membre")
+    private MembreModel membre;
+}