Create CHANGELOG.md

Author: Picaut

Diff for: CHANGELOG.md

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+# I-SIMPA 1.3.4 release version - 23 Dec 2020
+Changelog from last officiel release 1.2.3
+Changes in 4,451 files and 807 commits
+
+## Software
+* Upgrade to Python 3.8
+* Fix missing DLL files
+* 64 bit build version
+* Update main libraries
+* ... and many various fix
+
+## SPPS Code
+* Fix illegal memory allocation while executing SPPS from I-Simpa
+* Fix diffusion reflection algorithm
+* SPPS output extended information on reflection and particles in receivers event (only with displayed particules count)
+* ... and many various fix
+
+## Interface
+* Add Offline and Online documentation shortcuts
+* Fix application folder for language selection
+* Fix toolbar drawing issue by forcing slider to 16 pixel height
+* Add translations
+* ... and many various fix
+
+## Documentation
+* Add Online and Offline documentation
+* ... and many various fix
+
+## Features
+* Import 3D model in mm, cm, foot... unit
+* ... and many various fix
+
+## Bug corrections
+* Fix import 32 model from FreeCad
+* ... and many various fix