TL: added roadmap before I forget ...

docs/contributing.md

@@ -23,6 +23,8 @@ Current coverage is at 100%, so no untested line will be accepted 😇.
 
 > 📣 Know that no code styling formatter (like `black`, or else ...) will ever be imposed in CI, as long as I'm still breathing !
 
+In case you are interested in contributing, checkout out [current development roadmap 🎯](./devdoc/roadmap.md)
+
 ## Base recipes
 
 _A few base memo on how to develop this package ..._
@@ -41,4 +43,5 @@ _A few base memo on how to develop this package ..._
     devdoc/addRK
     devdoc/testing
     devdoc/updateDoc
+    devdoc/roadmap
 ```

docs/devdoc/roadmap.md

@@ -0,0 +1,36 @@
+# Development Roadmap
+
+📜 _Planned steps for the package development ..._
+
+**Status 3 - Alpha** : `v0.0.*`
+
+- ✅ main structure and design
+- ✅ full testing
+- ✅ base documentation (notebook)
+- ✅ documentation website (readthedocs)
+- ✅ developer documentation
+- ✅ pypi packaging and full installation doc
+- ✅ github community compliance
+- structure for embedded $Q$-coefficients and integration of those from [pySDC](https://github.com/Parallel-in-Time/pySDC)
+
+**Status 4 - Beta** : `v0.1.*`
+
+- citation file and zenodo releases
+- integration of `qmat` into [pySDC](https://github.com/Parallel-in-Time/pySDC)
+- full documentation of classes and functions
+- finalization of extended usage tutorials ($S$-matrix, `dTau` coefficient for initial sweep, prolongation)
+
+**Status 5 - Production/Stable** : `v1.0.*`
+
+- base console script interfacing `qmat` API for $Q$-coefficients and SDC coefficients generation (with IMEX)
+- integration of `qmat` into [SWEET](https://gitlab.inria.fr/sweet/sweet)
+- use of `qmat` for [Dedalus](https://github.com/DedalusProject/dedalus) IMEX SDC time-steppers developed within [pySDC](https://github.com/Parallel-in-Time/pySDC)
+- distribution to other people using former version of the core `qmat` code (_e.g_ Alex Brown from Exeter, ...)
+- addition of a few advanced usage tutorials :
+    - `qmat` for non-linear ODE
+    - multilevel SDC
+    - PFASST
+
+**Status 6 - Mature** : `v1.*.*`
+
+- [ ] integration of SDC-Butcher theory from J. Fregin (with associated console scripts)