Add README.md with basic goals outline

README.md

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+# Untitled Android PDF Reader
+Minimum Viable Goals:
+- [x] Continuous Horizontal Scroll - unreasonably rare feature
+- [x] Presentation View - i.e. show on an external monitor - haven't seen another app do this yet!
+- [x] Immersive View - no system status bar etc.
+- [ ] Open files the Android way - currently just a bundled test file
+- [ ] Delete+Reorder Pages - doesn't have to save the source file, but does need to save a change journal
+- [ ] Text Annotations - as above
+- [ ] Autocrop margins
+
+Stretch Goals:
+- [ ] Networked View:
+- - [ ] send PDF file to another client
+- - [ ] synchronize views for different readers
+- - [ ] coordinate views for one reader multiscreen
+- [ ] Pen Annotations
+- [ ] Improve overall UI