docs: Add instructions for configuring Scrum Helper with custom GitHub organizations

[Preeti9764]

Fixes issue #95
This PR updates the README.md to include a new section that explains how users can configure the Scrum Helper extension to work with any GitHub organization, not just FOSSASIA.

Changes: >Added setup instructions for customizing the organization name in API queries.
>Helps developers from other organizations adopt the extension more easily.

Summary by Sourcery

Documentation:

• Add a new README section detailing steps to set up Scrum Helper with a custom GitHub organization by editing the org: parameter in API calls

[sourcery-ai]

Reviewer's Guide

This PR updates the README to include a new section that instructs users on how to configure Scrum Helper for any GitHub organization by modifying the API query settings, and also applies minor markdown formatting adjustments for consistency.

File-Level Changes

Change	Details	Files
Added instructions for configuring a custom GitHub organization	Introduced “Using Scrum Helper with Your Own GitHub Organization” section Outlined steps to update the org name in the API query code Provided example snippet and rebuild instructions	README.md
Refined markdown formatting in existing sections	Removed extra blank lines and standardized list markers Consistent indentation under headings Adjusted spacing around code blocks and images	README.md

Possibly linked issues

• Document how the Scrum Helper extension can be used in any GitHub organization #95: The PR adds documentation in the README to explain how to configure the Scrum Helper extension for use with any GitHub organization, fulfilling the issue's request.

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[sourcery-ai]

Hey @Preeti9764 - I've reviewed your changes - here's some feedback:

• Remove the diff artifact plus signs from the code snippet (e.g., replace +org:fossasia+ with org:fossasia) so it shows valid JS syntax.
• Add the referenced screenshot under docs/images and update the markdown link to point to the correct file path instead of <Screenshot 2025-05-30 205822.png>.

Here's what I looked at during the review

• 🟡 General issues: 1 issue found
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Documentation: all looks good

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[sourcery-ai]

suggestion: Improve image alt text for Scrum example screenshot.

Use a more descriptive alt text, e.g., 'Example Scrum report generated by SCRUM Helper'.

Suggested change