docs: add quick start section for beginners

[sumedhaagh]

Added a Quick Start section in README to help new users quickly install and run Visdom locally.

Description

Motivation and Context

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• 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)
• Code refactor or cleanup (changes to existing code for improved readability or performance)

Checklist:

• I adapted the version number under py/visdom/VERSION according to Semantic Versioning
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.

Summary by Sourcery

Documentation:

• Add a Quick Start guide in the README covering installation, server startup, dashboard access, and a minimal Python usage example.

[sourcery-ai]

Reviewer's Guide

Adds a new 'Quick Start' section to the README that provides a minimal step-by-step guide for installing Visdom, starting the server, accessing the dashboard in a browser, and running a simple Python example.

Flow diagram for Quick Start steps to run Visdom locally

flowchart TD
  A[Read Quick Start section in README] --> B[Install Visdom using pip install visdom]
  B --> C[Start Visdom server using visdom]
  C --> D[Open browser and navigate to http://localhost:8097]
  D --> E[Create and run Python script using visdom.Visdom]
  E --> F[View text and scatter plot in Visdom dashboard]

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File-Level Changes

Change	Details	Files
Introduce a beginner-friendly Quick Start guide into the README to simplify initial setup and usage.	Added a 'Quick Start' heading and brief introductory sentence for new users. Documented pip-based installation command for Visdom. Documented how to start the Visdom server from the command line. Documented the default local URL for accessing the Visdom dashboard. Included a minimal Python example that connects to Visdom, renders text, and creates a scatter plot.	README.md

Possibly linked issues

• #(unknown): The PR’s Quick Start section adds exactly the step-by-step install, run, and example flow requested in the issue.

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[sourcery-ai]

Hey - I've left some high level feedback:

• Consider mentioning any minimum Python/pip version or environment assumptions in the Quick Start (e.g., that pip refers to the same interpreter you’ll run Visdom with) to avoid confusion for new users.
• You might want to show the server start command with an explicit port and host (e.g., visdom -port 8097 -host 0.0.0.0) and note that http://localhost:8097 is the default URL, so users know how to customize it if needed.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Consider mentioning any minimum Python/pip version or environment assumptions in the Quick Start (e.g., that `pip` refers to the same interpreter you’ll run Visdom with) to avoid confusion for new users.
- You might want to show the server start command with an explicit port and host (e.g., `visdom -port 8097 -host 0.0.0.0`) and note that `http://localhost:8097` is the default URL, so users know how to customize it if needed.

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[sumedhaagh]

Thanks for the feedback! I've updated the Quick Start section to clarify that pip should correspond to the same Python environment being used.
I've also mentioned the default host and port (localhost:8097) and noted that these can be customized using command line options if needed. Please let me know if any further improvements are required