Add: Developers' document

.gitignore

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 !/.gitignore
 !/build.gradle
 !/COPYING
+!/DEVDOC.md
 !/extra
 !/gradle
 !/gradle.properties

DEVDOC.md

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+## Development Progress
+
+- [ ] New architecture
+  
+   - [x] Activities: Main & Prefs
+  
+   - [ ] Fragments
+     
+      - [x] Main: Explore, Latest, Installed
+     
+      - [x] Prefs: Personalisation, Updates, Repositories, Other
+     
+      - [ ] Sub: App, AddRepo, Search
+  
+   - [ ] Using multi-sources in MainFragments
+  
+   - [ ] 
+
+## Progress on 1.0.0
+
+- [ ] Update all button
+
+- [ ] Support multiple mirrors
+
+- [ ] Show changelog of each release
+
+- [ ] Exodus
+
+- [ ] Better management of repositories
+  
+   - [ ] QR-Code reading
+  
+   - [ ] Sharing
+  
+   - [ ] Exporting/importing to a file
+
+- [ ] Theming
+
+## Low Priority/ Future nice-to-haves
+
+- [ ] Move to Compose
+
+- [ ] Material You theming
+
+- [ ] AndroidTV support
+
+- [ ] Apps' block and favorite lists