feat: add docs

internal/models/contact.go

@@ -1,8 +1,13 @@
 package models
 
+// Contact represents a contact entity
 type Contact struct {
-	ID      int    `json:"id" db:"id"`
-	Name    string `json:"name" db:"name"`
+	// ID is the unique identifier for the contact
+	ID int `json:"id" db:"id"`
+	// Name of the contact
+	Name string `json:"name" db:"name"`
+	// Company the contact works for
 	Company string `json:"company" db:"company"`
-	Phone   string `json:"phone" db:"phone"`
+	// Phone number in international format
+	Phone string `json:"phone" db:"phone"`
 }