Implemented http server exercise

exercises/05-http/go.go

@@ -0,0 +1,28 @@
+package main
+
+import (
+	"fmt"
+	"net/http"
+)
+
+type String string
+
+func (s String) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	fmt.Fprint(w, s)
+}
+
+type Struct struct {
+	Greeting string
+	Who      string
+	Punct    string
+}
+
+func (s Struct) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	fmt.Fprintf(w, "%v %v%v", s.Greeting, s.Who, s.Punct)
+}
+
+func main() {
+	http.Handle("/string/", String("I am a freaking zealot."))
+	http.Handle("/struct/", Struct{"hello", "world", "!"})
+	http.ListenAndServe("localhost:4000", nil)
+}