client deployment process to write/document

[Nico-Duduf]

• Ubuntu 18.04
• Ubuntu 20.04
• Win
• Mac
• build on older ubuntu with Qt 5.9 &openssl 1.0 /// and 20.04 with Qt 5.12(test!!) & openssl 1.1 (use 20.10 or 21.04?)
• package 2 deb for both ubuntu versions / openssl 1.0 / 1.1
• package 2 appimages for both ubuntu versions / openssl 1.0 / 1.1
• add openssl in dependencies for the deb package / warn it must be avail with the appimage
• win
• mac