Add library overview

[Dickson-Mwendia]

No description provided.

[opbld30]

Learn Build status updates of commit 9b7499b:

⚠️ Validation status: warnings

File	Status	Preview URL	Details
nodejs/overview/overview.md	⚠️Warning	View (msal-js-latest)	Details

nodejs/overview/overview.md

• Line 16, Column 3: [Warning: file-not-found - See documentation] Invalid file link: 'lib/msal-node/'.
• Line 22, Column 3: [Warning: file-not-found - See documentation] Invalid file link: 'lib/msal-browser/'.
• Line 24, Column 3: [Warning: file-not-found - See documentation] Invalid file link: 'lib/msal-react/'.
• Line 26, Column 3: [Warning: file-not-found - See documentation] Invalid file link: 'lib/msal-angular/'.
• Line 28, Column 3: [Warning: file-not-found - See documentation] Invalid file link: 'lib/msal-core/'.
• Line 36, Column 1: [Warning: file-not-found - See documentation] Invalid file link: 'docs/diagrams/png/PackageStructure.png'.
• Line 48, Column 3: [Warning: file-not-found - See documentation] Invalid file link: '../../issues'.
• Line 2, Column 1: [Suggestion: description-missing - See documentation] Missing required attribute: 'description'.
• Line 8, Column 146: [Suggestion: docs-link-absolute - See documentation] Absolute link 'https://docs.microsoft.com/azure/active-directory/develop/v2-overview' will be broken in isolated environments. Replace with a relative link.
• Line 8, Column 395: [Suggestion: docs-link-absolute - See documentation] Absolute link 'https://docs.microsoft.com/azure/active-directory-b2c/active-directory-b2c-overview#identity-providers' will be broken in isolated environments. Replace with a relative link.
• Line 16, Column 283: [Suggestion: docs-link-absolute - See documentation] Absolute link 'https://docs.microsoft.com/azure/active-directory/develop/v2-protocols-oidc' will be broken in isolated environments. Replace with a relative link.
• Line 22, Column 270: [Suggestion: docs-link-absolute - See documentation] Absolute link 'https://docs.microsoft.com/azure/active-directory/develop/v2-oauth2-auth-code-flow' will be broken in isolated environments. Replace with a relative link.
• Line 22, Column 398: [Suggestion: docs-link-absolute - See documentation] Absolute link 'https://docs.microsoft.com/azure/active-directory/develop/v2-protocols-oidc' will be broken in isolated environments. Replace with a relative link.
• Line 28, Column 264: [Suggestion: docs-link-absolute - See documentation] Absolute link 'https://docs.microsoft.com/azure/active-directory/develop/v2-oauth2-implicit-grant-flow' will be broken in isolated environments. Replace with a relative link.
• Line 28, Column 383: [Suggestion: docs-link-absolute - See documentation] Absolute link 'https://docs.microsoft.com/azure/active-directory/develop/v2-protocols-oidc' will be broken in isolated environments. Replace with a relative link.

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