Initial bootrap of application

- Creates scaffold for router and server
- Main program set up for environment, OS signal listener
- Makefile generic commands

internal/http/response.go

@@ -0,0 +1,43 @@
+package http
+
+import (
+	"context"
+	"encoding/json"
+	"net/http"
+)
+
+func (s *server) writeSuccess(ctx context.Context, w http.ResponseWriter, data interface{}, status int) error {
+	if status != 0 {
+		w.WriteHeader(status)
+	}
+
+	if data != nil {
+		err := json.NewEncoder(w).Encode(data)
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func (s *server) writeError(ctx context.Context, w http.ResponseWriter, err error, code int) error {
+	if http.StatusText(code) == "" {
+		return ErrUnrecognizedCode
+	}
+
+	if err == nil {
+		err = ErrUnknownError
+	}
+
+	s.logger.Errorf("request failed: %v", err.Error())
+	w.WriteHeader(code)
+
+	res := struct {
+		Message string `json:"message"`
+	}{
+		Message: http.StatusText(code),
+	}
+
+	return json.NewEncoder(w).Encode(res)
+}