Added skeleton code for register endpoint (#2)

Reviewed-on: phoenix/textsender-auth#2
Co-authored-by: phoenix <kundeng00@pm.me>
Co-committed-by: phoenix <kundeng00@pm.me>

internal/middleware/middleware.go

@@ -0,0 +1,22 @@
+package middleware
+
+import (
+	"log"
+	"net/http"
+	"time"
+)
+
+func Logging(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		start := time.Now()
+		next.ServeHTTP(w, r)
+		log.Printf("%s %s %v", r.Method, r.URL.Path, time.Since(start))
+	})
+}
+
+func JSONContentType(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "application/json")
+		next.ServeHTTP(w, r)
+	})
+}