Improve Setup section with beginner-friendly installation steps

[Nikita2106-05]

Description

This PR improves the "Setup" section in the README by making it more beginner-friendly and easier to follow.

Changes

• Added step-by-step installation instructions
• Included instructions to start the Visdom server
• Added guidance on accessing the dashboard
• Included a simple example for first-time users

Impact

This will help new users and contributors quickly understand how to install and run Visdom locally without confusion.

Type of Change

• Documentation update

Summary by Sourcery

Documentation:

• Clarify and simplify the README setup instructions with a step-by-step local installation guide using pip.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Refines the README Setup section to provide a clearer, step-by-step local installation flow for Visdom using pip, making it more approachable for beginners.

File-Level Changes

Change	Details	Files
Clarify and reformat the Setup section to present a beginner-friendly, step-by-step pip installation instruction.	Added an introductory sentence explaining that the Setup section is a step-by-step guide for local installation and running Visdom. Introduced a new subheading for the first step of installation (Install Visdom). Replaced the terse 'Install from pip' line and shell-style prompt with a plain pip install command block suitable for copy-paste.	README.md

Possibly linked issues

• #Improve installation instructions for new contributors: PR updates README Setup with pip install, server start, dashboard access, and simple example as requested in issue.

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[sourcery-ai]

Hey - I've left some high level feedback:

• The numbered subheading ### 1. Install Visdom introduces a list but the subsequent "Install from source" section is left outside that structure; consider either converting all setup paths into a consistent numbered list or removing the numbering to keep the section stylistically uniform.
• The original sentence "Python and web clients come bundled with the python server." was removed; if still accurate, it may be useful to keep this clarification somewhere in the Setup section so users understand what gets installed with the package.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- The numbered subheading `### 1. Install Visdom` introduces a list but the subsequent "Install from source" section is left outside that structure; consider either converting all setup paths into a consistent numbered list or removing the numbering to keep the section stylistically uniform.
- The original sentence "Python and web clients come bundled with the python server." was removed; if still accurate, it may be useful to keep this clarification somewhere in the Setup section so users understand what gets installed with the package.

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