Add load/save functionality

[JessicaMulein]

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[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +1.29% (target: -1.00%)	✅ 59.77%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (7ce33d3)	1578	1052	66.67%
Head commit (1489c5e)	1654 (+76)	1124 (+72)	67.96% (+1.29%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#28)	266	159	59.77%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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