add from_flat

[dougbrn]

Change Description

Resolves #112

• My PR includes a link to the issue that I am addressing

Solution Description

Code Quality

• I have read the Contribution Guide
• My code follows the code style of this project
• My code builds (or compiles) cleanly without any errors or warnings
• My code contains relevant comments and necessary documentation

[github-actions]

Before [3cd3baa] <v0.1.2>	After [1102017]	Ratio	Benchmark (Parameter)
9.17±0.1ms	9.24±0.06ms	1.01	benchmarks.NestedFrameAddNested.time_run
1.11±0.01ms	1.12±0.01ms	1.01	benchmarks.NestedFrameReduce.time_run
86.9M	86.7M	1	benchmarks.NestedFrameAddNested.peakmem_run
6.36±0.08ms	6.37±0.1ms	1	benchmarks.NestedFrameQuery.time_run
90.1M	90.1M	1	benchmarks.NestedFrameReduce.peakmem_run
32.0±3ms	31.6±3ms	0.99	benchmarks.AssignSingleDfToNestedSeries.time_run
266M	261M	0.98	benchmarks.AssignSingleDfToNestedSeries.peakmem_run
93.3M	91.1M	0.98	benchmarks.NestedFrameQuery.peakmem_run
283M	278M	0.98	benchmarks.ReassignHalfOfNestedSeries.peakmem_run
61.6±3ms	59.1±2ms	0.96	benchmarks.ReassignHalfOfNestedSeries.time_run

Click here to view all benchmarks.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.44%. Comparing base (3cd3baa) to head (5762116).
Report is 48 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #123   +/-   ##
=======================================
  Coverage   99.43%   99.44%           
=======================================
  Files          14       14           
  Lines         889      898    +9     
=======================================
+ Hits          884      893    +9     
  Misses          5        5           

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[hombit]

Thank you. Please find a minor doc suggestion