added support for Caesar cipher

[guillp]

No description provided.

[codecov]

Codecov Report

Merging #4 (46d9b5a) into main (6983e38) will increase coverage by 0.02%.
Report is 1 commits behind head on main.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main       #4      +/-   ##
==========================================
+ Coverage   99.72%   99.74%   +0.02%     
==========================================
  Files          13       15       +2     
  Lines         362      394      +32     
==========================================
+ Hits          361      393      +32     
  Misses          1        1              

Files Changed	Coverage Δ
binapy/encoding/__init__.py	100.00% <100.00%> (ø)
binapy/encoding/dumb.py	100.00% <100.00%> (ø)

... and 2 files with indirect coverage changes