feat: add pkg/training/ with types, structs, and repository interfaces

pkg/training/attendee.go

@@ -0,0 +1,17 @@
+package training
+
+import "github.com/google/uuid"
+
+type AttendeeID uuid.UUID
+
+type Attendee struct {
+	ID          AttendeeID
+	DateID      DateID
+	Name        string
+	Email       string
+	Company     string
+	Role        string
+	IsStudent   bool
+	HasAttended bool
+	HasPaid     bool
+}