feat: add basic http server with hello world

cmd/dropr-server/main.go

@@ -0,0 +1,28 @@
+package main
+
+import (
+	"fmt"
+	"net/http"
+)
+
+func main() {
+	const PORT = ":8080"
+
+	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(http.StatusOK)
+		w.Header().Set("Content-Type", "text/plain")
+
+		_, err := fmt.Fprintf(w, "Hello, World!")
+		if err != nil {
+			http.Error(w, "Internal Server Error", http.StatusInternalServerError)
+			return
+		}
+	})
+
+	fmt.Println("Listening on port " + PORT)
+	err := http.ListenAndServe(PORT, nil)
+
+	if err != nil {
+		panic(err)
+	}
+}