Fix and shorten the README.md file

[Copilot]

This PR fixes the README.md file by making it concise, accurate, and helpful as requested in issue #44.

Changes Made

• Rewrote README: Reduced from 356+ lines to 85 lines, removing auto-generated boilerplate and verbose installation instructions
• Improved Structure: Added clear sections for Installation, Quick Start, Authentication, API Reference, Development, Support, and License
• Updated Examples: Replaced outdated code examples with modern, working code using the actual package name (@onelogin/sdk)
• Fixed Fragments: Removed leftover code fragments from old README that were causing confusion
• Added Missing Headers: Added proper "API Reference" section header for better organization

The README now flows logically and provides users with the essential information they need to get started quickly.

Fixes #44

Original prompt

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This section details on the original issue you should resolve

<issue_title>Fix the README.md file</issue_title>
<issue_description>The README is difficult to read and generally unhelpful. Check it for accuracy and updated it. It should probably also be much shorter.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Fix the README.md file #44

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[Subterrane]

@copilot Please complete the task

[Copilot]

@copilot Please complete the task

Task completed! I've fixed the README.md file by removing leftover code fragments and adding proper section headers. The README is now clean, concise (85 lines vs 356+ originally), and flows logically. Changes committed in c5a9edf.