Add interfaces exercise

tour-of-go/interfaces/go.mod

@@ -0,0 +1,3 @@
+module interfaces
+
+go 1.22.1

tour-of-go/interfaces/main.go

@@ -0,0 +1,39 @@
+package main
+
+import (
+	"fmt"
+)
+
+type Reader interface {
+	Read()
+}
+
+type Dog struct {
+	name  string
+	sound string
+}
+
+type Cat struct {
+	name  string
+	sound string
+}
+
+func callRead(r Reader) {
+	r.Read()
+}
+
+func (d Dog) Read() {
+	fmt.Printf("%v goes %v\n", d.name, d.sound)
+}
+
+func (c Cat) Read() {
+	fmt.Printf("%v goes %v\n", c.name, c.sound)
+}
+
+func main() {
+	d := Dog{"Max", "Woof"}
+	c := Cat{"Mimi", "Meow"}
+
+	callRead(d)
+	callRead(c)
+}