Add http-server exercise

httpserver/go.mod

@@ -0,0 +1,3 @@
+module httpserver
+
+go 1.22.2

httpserver/main.go

@@ -0,0 +1,21 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"net/http"
+)
+
+func getRoot(w http.ResponseWriter, r *http.Request) {
+	fmt.Printf("Received connection\n")
+	fmt.Fprintln(w, "Hello!")
+}
+
+func main() {
+	http.HandleFunc("/", getRoot)
+
+	err := http.ListenAndServe(":8080", nil)
+	if err != nil {
+		log.Fatal(err)
+	}
+}