📝 Update README.md

Author: RemiBardon

README.md

@@ -1,8 +1,51 @@
 # SwiftGeo
 
-A modern Swift package for working with geographical data.
+The toolbox for any Swift project working with geographical data.
 
-It contains a lot of Swift ports from [Turf](https://github.com/Turfjs/turf),
-but sometimes written in a Swiftier way.
+Works on client and server sides – it's just Swift.
 
-*This repository is maintained, but not actively.*
+## To-do list
+
+> **Note**
+> Items are not especially ordered.
+
+- Features
+  - [x] Geodesic data types
+  - [x] Coordinate Reference System conversions
+  - Parsing/printing (using parser-printers)
+    - Formats
+      - [ ] GeoJSON
+      - [ ] WKT
+      - [ ] GPX
+      - [ ] Other formats
+    - [ ] Streaming
+  - [ ] Full translation of [Turf](https://github.com/Turfjs/turf)
+  - [ ] Integration with MapKit
+  - [ ] Code generation to support all EPSG Coordinate Reference Systems
+  - [ ] Dynamic Coordinate Reference System (for parsing any CRS)
+- Developer experience
+  - [x] Type-safety
+  - [ ] Comprehensive error handling
+  - [ ] Packaging
+  - Documentation
+    - [ ] Doc comments
+    - [ ] [DocC](https://www.swift.org/documentation/docc/)
+    - [ ] Illustrations
+    - [ ] Online documentation
+    - [ ] Use cases
+  - [ ] Playground
+- Tests
+  - [ ] Full coverage
+  - [ ] Snapshot testing
+- Platform compatibility
+  - [ ] macOS (`MapKit` integration)
+  - [ ] Others (open-source `Foundation`…)
+- Benchmarks
+  - [ ] Binary size benchmarks (`@inlinable`, optimizations…)
+  - [ ] Performance benchmarks (CPU, RAM…)
+
+## Development and maintenance
+
+- This repository is being actively developed.
+- It will be maintained, but not actively.
+- PRs are welcome ❤️ They will be reviewed and integrated unless something is wrong.