Document roadmap of planned features

For now this is just a collection of feature wishes but
feel free to grab any of those ideas and implement it.

Reviewed-on: https://git.mills.io/prologic/tube/pulls/68

ROADMAP.md

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+# Roadmap
+
+This is mostly a collection of ideas and wishes.
+The best way to make those things happen, is to actually do them.
+
+If you want to start working on any of those features, please take
+a look at the [contributing guidelines](CONTRIBUTING.md) and open
+an issue to let us know and to discuss the details.
+
+## In Progress
+
+- refactor [uploadHandler](https://git.mills.io/prologic/tube/src/commit/c0ca374a16a75acbf380b133dde6529d7f66bb2b/app/app.go#L226)
+
+## Prioritized
+
+- extract hardcoded ffmpeg parameters into config.json
+- Add ability to override `config.json` configuration via env variables. This would make a containerized version of tube much easier to deploy.
+
+## Unsorted
+
+- edit video
+    - edit title / description
+    - edit thumbnail (select position + generate, or upload?)
+- delete video
+- background transcoding / scaling
+- importer framework
+    - allow integration with tools like [yt-dlp](https://github.com/yt-dlp/yt-dlp)
+    - allow integration with any tool that fetches a video file from a url
+- library backend framework
+    - Support for S3 Bucket for file storage
+    - Support for recursive scanning of a library path
+    - Support for read-only library sections
+- player/server: on-the-fly scale-down
+- uploader: check uploaded files for allowed format/codec combinations to avoid unnecessary transcoding
+- on the fly transcoding (accessing large collection, w/o need for batch transcoding)