Create SET cache endpoint

Cache SET endpoint implementation

Closes #3 (closed) FYI: @tziai @valerii.kalashnikov

internal/config/config.go

@@ -11,7 +11,7 @@ type Config struct {
 
 type httpConfig struct {
 	Host         string        `envconfig:"HTTP_HOST"`
-	Port         string        `envconfig:"HTTP_PORT" default:"8083"`
+	Port         string        `envconfig:"HTTP_PORT" default:"8080"`
 	IdleTimeout  time.Duration `envconfig:"HTTP_IDLE_TIMEOUT" default:"120s"`
 	ReadTimeout  time.Duration `envconfig:"HTTP_READ_TIMEOUT" default:"10s"`
 	WriteTimeout time.Duration `envconfig:"HTTP_WRITE_TIMEOUT" default:"10s"`