new release draft description

Author: elenafuengar

release.md

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+# v0.5.0 Draft
+*Comming soon!*
+
+## New Features
+* Perfect Matching Layers (PML) boundary conditions
+* Plot field on STL solid using `pyvista.sample` interpolation algorithm 
+    * Interactive plane clipping on `plot3DonSTL`
+    * Field shown on clipping plane
+* Wake extrapolation of partially decayed wakes coupling new package `ImpedanCEI/iddefix` 
+* Conversion from impedance to wake function and viceversa with user-defined arbitrary sampling
+
+## Tag highlights
+* Nightly tests with Github actions 
+* :file_folder: notebooks containing interactive examples
+* :file_folder: examples: major cleanup, examples on CPU and GPU
+
+## Bugfixes
+* Patch representation when a list is passed in `Plot2D`
+* `ipympl` added as a dependency to `wakis['notebook']` installation
+* Injection time to account for relativistic beta