Doc: create releasenotes

Author: rhinoella

gudpy/core/ReleaseNotes.md

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+**GudPy Release 0.5.0**
+
+Large GudPy backend rework.
+
+- Project folder support for inputs and outputs
+- All processes done safely in temporary directory
+- Rework GUI threading process
+- Encapsulate code to create full separation between frontend and backend
+- Separate gui.core.mainWindow into controller and view
+- Process execution responsibilities are now all are handed in core.gudpy
+