Adding GitHub repository source and improving tool's README.md and testing

[shahariaazam]

Added

• Added meta data for GitHub repo scanner.
• Added table of contents for README.md file.
• Using GitHub super linter.
• CI status badge.
• Added GitHub repository source.
• Added tests for buildsource.
• Added tests for "Find" method.
• Added more tests for PostgreSQL.
• Added more badges to README.md.
• Added integrity attribute used for cytoscape.

Changed

• Updated README.md.
• Improved README.md with a better introduction about the tool.

Removed

• Removed finding and printing resources code from discover command.

Fixed

• Fixed linting errors.
• Fixed a code smell.
• Fixed tests for config.go.
• Fixed minor bug.
• Fixed few linters.
• Renamed a workflow job.

[codecov]

Codecov Report

Patch coverage: 77.49% and project coverage change: +27.78 🎉

Comparison is base (abeb034) 39.50% compared to head (763a076) 67.29%.

Additional details and impacted files

@@             Coverage Diff             @@
##           master       #7       +/-   ##
===========================================
+ Coverage   39.50%   67.29%   +27.78%     
===========================================
  Files          10       11        +1     
  Lines         648      801      +153     
===========================================
+ Hits          256      539      +283     
+ Misses        384      225      -159     
- Partials        8       37       +29     

Impacted Files	Coverage Δ
pkg/processor/processor.go	83.33% <ø> (ø)
pkg/resource/resource.go	100.00% <ø> (ø)
pkg/source/scanner/mock_scanner.go	0.00% <0.00%> (ø)
pkg/storage/storage.go	92.85% <ø> (+64.73%)	⬆️
pkg/storage/storage_mock.go	0.00% <0.00%> (ø)
pkg/util/util.go	100.00% <ø> (ø)
pkg/storage/postgresql.go	48.51% <35.48%> (+48.51%)	⬆️
pkg/source/scanner/github_repo_scanner.go	95.16% <95.16%> (ø)
pkg/config/config.go	100.00% <100.00%> (ø)
pkg/source/scanner/fs_scanner.go	70.49% <100.00%> (ø)
... and 1 more

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[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

84.7% Coverage
0.0% Duplication