doc(roadmap): basic roadmap

ROADMAP.md

+# Roadmap
+
+**Rotare** is still under active development. As my thesis focuses on analysis
+of coaxial propellers and rotors, this will be the top priority during the
+following months.
+
+_Note_: The following version numbers are a simple suggestion for the roadmap.
+It is very likely that some breaking changes will occur occasionally, forcing a
+bump of major version (1.x.x -> 2.x.x).
+
+## v1.0.0 - Single rotor
+- [x] Single rotor/propeller
+- [x] Varying airfoil
+- [x] Custom chord/twist
+- [x] Steady/hover
+- [x] Axial flow
+- [x] Tip/hub losses
+- [x] Polar extension to [-180; 180] deg
+- [ ] Validation for hovering rotor
+- [ ] Validation for propeller in axial flow
+- [ ] Documentation: _User manual_
+
+## v1.1.0 - Complete documentation
+- [ ] Documentation: _Technical manual_
+
+## v1.2.0 - Extension models
+- [ ] Compressibility effects
+- [ ] Tip relief
+- [ ] Spinner effects
+
+## v1.3.0 - Coaxial in axial flow
+- [ ] Stahlhut solver
+- [ ] Indvel solver
+- [ ] Indfact solver
+- [ ] Validation
+- [ ] Documentation
+
+## v1.4.0 - Single rotors in oblique flows
+- [ ] Stahlhut solver
+- [ ] Indvel solver
+- [ ] Indfact solver
+- [ ] Validation
+- [ ] Documentation
+
+## v1.5.0 - Coaxial in oblique flows
+- [ ] Vortex model for the wake
+- [ ] Stahlhut solver
+- [ ] Validation
+- [ ] Documentation
+
+## vX.X.X - Wind turbines and autorotation
+
+## vX.X.X - Overlapping rotors