SNOW-1758373 Documentation for package signature verification

[sfc-gh-knozderko]

Description

SNOW-1758373 Documentation for package signature verification.

Checklist

• [ ] Code compiles correctly
• [ ] Code is formatted according to Coding Conventions
• [ ] Created tests which fail without the change (if possible)
• [ ] All tests passing (dotnet test)
• [x] Extended the README / documentation, if necessary
• [x] Provide JIRA issue id (if possible) or GitHub issue id in PR name

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 86.14%. Comparing base (8199563) to head (258fcf6). Report is 5 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1049 +/- ## ========================================== - Coverage 86.14% 86.14% -0.01% ========================================== Files 120 120 Lines 11627 11648 +21 Branches 1165 1174 +9 ========================================== + Hits 10016 10034 +18 - Misses 1328 1332 +4 + Partials 283 282 -1 ```

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