Docs: Improve installation section and add troubleshooting guide

[HariharanBalakrishnan22]

---

name: Pull Request
about: Create a pull request to contribute to the project
title: 'Docs: Improve installation section and add troubleshooting guide'
labels: ''
assignees: ''

Related Issue
Fixes #(issue)

Description of Changes

• Added clarification in the Installation section about Python 3.7+ requirement
• Suggested running pip install --upgrade pip if users face installation issues
• Added a Troubleshooting guide for "Port already in use" error when running Preswald locally

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• New example
• Test improvement

Testing
-No code changes involved.
-Reviewed the README.md formatting on local machine to ensure clean layout.

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have run my code against examples and ensured no errors
• Any dependent changes have been merged and published in downstream modules

[shivam-singhal]

Great PR, can you address the change and then i can merge

[shivam-singhal]

*3.10, not 3.7