v0.5.0

[bigcat88]

Changes proposed in this pull request:

• Adjusted AI example to use automatic model download feature
• Adjusted Makefiles of all examples
• Fixed missing default icon for files_dropdown_menu API
• Updated README.md

[codecov]

Codecov Report

Merging #153 (37c2861) into main (84de0f2) will not change coverage.
The diff coverage is 100.00%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #153   +/-   ##
=======================================
  Coverage   99.77%   99.77%           
=======================================
  Files          34       34           
  Lines        3134     3134           
=======================================
  Hits         3127     3127           
  Misses          7        7           

Files	Coverage Δ
nc_py_api/_version.py	100.00% <100.00%> (ø)
nc_py_api/ex_app/ui/files.py	100.00% <ø> (ø)