Added bell_kets constant

[bdoolittle]

No description provided.

[codecov]

Codecov Report

Merging #3 into integration will decrease coverage by 0.30%.
The diff coverage is n/a.

@@               Coverage Diff               @@
##           integration       #3      +/-   ##
===============================================
- Coverage        95.14%   94.84%   -0.31%     
===============================================
  Files               11       11              
  Lines              247      252       +5     
===============================================
+ Hits               235      239       +4     
- Misses              12       13       +1     

Impacted Files	Coverage Δ
src/States.jl	91.11% <ø> (ø)
src/QMath/validation.jl	100.00% <0.00%> (ø)
src/QMath/coordinates.jl	0.00% <0.00%> (ø)
src/Observables.jl	98.27% <0.00%> (+0.03%)	⬆️

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