Created Roadmap (markdown)

Roadmap.md

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+## Roadmap
+
+[*Official Roadmap*](https://github.com/pirate/ArchiveBox/issues/120).
+
+If you feel like contributing a PR, some of these tasks are pretty easy.  Feel free to open an issue if you need help getting started in any way!
+
+**Major upcoming changes:**
+
+ - finalize python packaging to allow installing via pip and importing individual componenets
+ - add an optional web GUI for managing sources, adding new links, and viewing the archive
+
+**Minor upcoming changes:**
+ - download closed-captions text from youtube videos
+ - body text extraction using [fathom](https://hacks.mozilla.org/2017/04/fathom-a-framework-for-understanding-web-pages/)
+ - auto-tagging based on important extracted words
+ - audio & video archiving with `youtube-dl`
+ - full-text indexing with elasticsearch/elasticlunr/ag
+ - video closed-caption downloading on Youtube for full-text indexing of video content
+ - automatic text summaries of article with nlp summarization library
+ - featured image extraction
+ - http support (from my https-only domain)
+ - try wgetting dead sites from archive.org (https://github.com/hartator/wayback-machine-downloader)