add updog to File Transfer - Web-based File Managers (#2714)

README.md

@@ -840,6 +840,7 @@ _Related: [Groupware](#groupware)_
 - [s3server](https://github.com/jessfraz/s3server) - Simple HTTP interface to index and browse files in a public S3 or Google Cloud Storage bucket. `MIT` `Go`
 - [Surfer](https://git.cloudron.io/cloudron/surfer) - Simple static file server with webui to manage files. `MIT` `Nodejs`
 - [TagSpaces](https://www.tagspaces.org/) - TagSpaces is an offline, cross-platform file manager and organiser that also can function as a note taking app. The WebDAV version of the application can be installed on top of a WebDAV servers such as Nextcloud or ownCloud. ([Demo](https://demo.tagspaces.com), [Source Code](https://github.com/tagspaces/tagspaces)) `AGPL-3.0` `Javascript`
+- [updog](https://github.com/sc0tfree/updog) - Updog is a replacement for Python's SimpleHTTPServer. It allows uploading and downloading via HTTP/S, can set ad hoc SSL certificates and use http basic auth. `MIT` `Python`
 
 
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