fixed bug with default `maxUploadFilesCount` prop

`maxUploadFilesCount`, `maxUploadFileSize` props added

package description updated

.vue extension added in import statements; README updated

create folder functionality; README updated

webpack init; remove folder functionality

do not modify FileBrowser's prop `axios`, use `data.axiosInstance` instead

`axios` installed as dependency

init from https://github.com/NordicSoft/express-template

Initial commit