Package description and documentation updates

[ionite34]

• Added package description
• DecodeError explanation on Readme
• Version bump to 0.1.1

[codecov]

Codecov Report

Merging #4 (c453f16) into main (12fe0a5) will decrease coverage by 0.94%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main       #4      +/-   ##
==========================================
- Coverage   95.28%   94.33%   -0.95%     
==========================================
  Files           3        3              
  Lines         106      106              
==========================================
- Hits          101      100       -1     
- Misses          5        6       +1     

Flag	Coverage Δ
pytest	94.33% <ø> (-0.95%)	⬇️
rust-llvm-cov	94.33% <ø> (-0.95%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/lib.rs	94.73% <0.00%> (-5.27%)	⬇️

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