Partially update example_service to include the JSON feature

Its only partial because currently the function `structs.FillStructWith`
doesn't support the attributes tagged as `kissorm:"?,json"`

The task of updating the FillStructWith was updated to include this
behavior

README.md

@@ -250,6 +250,7 @@ ok  	github.com/vingarcia/kissorm	21.740s
 - Improve error messages
 - Add tests for tables using composite keys
 - Add support for serializing structs as other formats such as YAML
+- Update structs.FillStructWith to work with `json` tagged attributes
 
 ### Optimizations Oportunities
 

examples/example_service/example_service.go

@@ -30,6 +30,15 @@ type UserEntity struct {
 	Age         *int      `kissorm:"age"`
 	Score       *int      `kissorm:"score"`
 	LastPayment time.Time `kissorm:"last_payment"`
+	Address     *Address  `kissorm:"address,json"`
+}
+
+// Address contains the user's address
+type Address struct {
+	AddrLines []string `json:"addr_lines"`
+	City      string   `json:"city"`
+	State     string   `json:"state"`
+	Country   string   `json:"country"`
 }
 
 // NewUserService ...