Define zeros

[mtfishman]

Supersedes ITensor/BlockSparseArrays.jl#85.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.98%. Comparing base (8714abd) to head (8fad808).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #9      +/-   ##
==========================================
+ Coverage   81.94%   81.98%   +0.03%     
==========================================
  Files          29       29              
  Lines         947      949       +2     
==========================================
+ Hits          776      778       +2     
  Misses        171      171              

Flag	Coverage Δ
docs	0.00% <0.00%> (ø)

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