Translations:Release notes 0.20/166/en

Extensive documentation can be found at the main FreeCAD Assembly3 wiki page or Realthunder's GitHub Assembly3 wiki
 * Asm3_1_relnotes_0.20.jpg
 * Main features:
 * Dynamic/interactive solver: move parts with the mouse while the solver constrains the motion.
 * Links: use one single part multiple times in an assembly.
 * External links: allows usage of parts from external documents.
 * Hierarchical assemblies: permits the creation of sub assemblies.
 * Assembly freeze: assemblies that are not required to remain dynamic can be excluded from calculations and are considered fixed geometry by the asm3 solver.
 * And much more.
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