Adding info about docker and MacOS

[germa89]

As the title.

This PR adds info about running a docker MAPDL container and to use it within a MacOS device.

Close #2184

[codecov]

Codecov Report

Merging #2231 (391515e) into main (e3885fb) will increase coverage by 1.31%.
Report is 83 commits behind head on main.
The diff coverage is 93.68%.

@@            Coverage Diff             @@
##             main    #2231      +/-   ##
==========================================
+ Coverage   86.39%   87.71%   +1.31%     
==========================================
  Files          45       45              
  Lines        7977     8302     +325     
==========================================
+ Hits         6892     7282     +390     
+ Misses       1085     1020      -65