Add NuGet cache

[rjmurillo]

Update the main workflow to include NuGet cache restore and save. This improves build times marginally on Windows VMs

[codacy-production[bot]]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
:white_check_mark: +0.00% (target: -1.00%)	:white_check_mark: ∅

Coverage variation details

| | Coverable lines | Covered lines | Coverage | | ------------- | ------------- | ------------- | ------------- | | Common ancestor commit (cff00c72eb12c0be4535b42fd2dc0d19940c384a) | 283 | 210 | 74.20% | | | Head commit (6f1c6e2c6027624581856bc78ebaa1ef2663414b) | 283 (+0) | 210 (+0) | 74.20% (**+0.00%**) | **Coverage variation** is the difference between the coverage for the head and common ancestor commits of the pull request branch: ` - `

Diff coverage details

| | Coverable lines | Covered lines | Diff coverage | | ------------- | ------------- | ------------- | ------------- | | Pull request (#19) | 0 | 0 | **∅ (not applicable)** | **Diff coverage** is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: `/ * 100%`

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