Add virtual environment setup instructions to README

[ChloeAnn08]

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• Have you followed the guidelines stated in CONTRIBUTING.md file?
• Have you checked to ensure there aren't any other open Pull Requests for the desired changed?

Type of change

Please delete options that are not relevant.

• This change requires a documentation update

Description

Users installing Reflex without a virtual environment often encounter PATH issues where the reflex CLI command is not recognized. Restructured the Installation and "Create your first app" sections in the README to match the Reflex website Installation guide.

Changes Made

• Updated Installation section to include virtual environment warning
• Restructured "Create your first app" section with numbered steps
• Added virtual environment setup instructions for Windows and macOS/Linux
• Added troubleshooting section for PATH issues

[greptile-apps]

Greptile Overview

Summary

This PR improves the README installation documentation by adding virtual environment setup instructions and restructuring the "Create your first app" section into clear numbered steps. The changes address a common user issue where the reflex CLI command is not found when installed without a virtual environment due to PATH configuration problems.

Key improvements:

• Added prominent warning recommending virtual environment usage before installation
• Restructured quickstart into 5 clear numbered steps (create directory, setup venv, install, initialize, run)
• Added platform-specific virtual environment commands for Windows and macOS/Linux
• Included troubleshooting section with fallback python3 -m reflex command syntax

The documentation now aligns with the Reflex website installation guide and provides a better onboarding experience for new users.

Confidence Score: 5/5

• This PR is safe to merge with minimal risk - it only modifies documentation without touching any code
• Documentation-only change with clear improvements to user onboarding experience. The virtual environment setup instructions follow Python best practices and match industry standards. The only minor consideration is that localized README files were not updated, but this doesn't impact functionality.
• No files require special attention

Important Files Changed

File Analysis

Filename	Score	Overview
README.md	5/5	Restructured installation section with virtual environment setup instructions and added troubleshooting guidance for PATH issues

Sequence Diagram

sequenceDiagram
    participant User
    participant Terminal
    participant VirtualEnv as Virtual Environment
    participant Pip
    participant Reflex as Reflex CLI

    User->>Terminal: mkdir my_app_name && cd my_app_name
    Terminal-->>User: Directory created

    User->>Terminal: python -m venv .venv
    Terminal->>VirtualEnv: Create virtual environment
    VirtualEnv-->>Terminal: .venv created
    Terminal-->>User: Virtual environment ready

    User->>Terminal: Activate virtual environment
    Terminal->>VirtualEnv: Activate .venv
    VirtualEnv-->>Terminal: Environment activated
    Terminal-->>User: (.venv) prompt shown

    User->>Terminal: pip install reflex
    Terminal->>Pip: Install reflex package
    Pip->>Reflex: Download and install
    Reflex-->>Pip: Installation complete
    Pip-->>Terminal: reflex installed
    Terminal-->>User: reflex command available in PATH

    User->>Terminal: reflex init
    Terminal->>Reflex: Initialize project
    Reflex-->>Terminal: Template created
    Terminal-->>User: Project initialized

    User->>Terminal: reflex run
    Terminal->>Reflex: Start development server
    Reflex-->>Terminal: Server running at localhost:3000
    Terminal-->>User: App accessible

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[greptile-apps]

style: Missing colon after "Create and activate virtual environment"

Suggested change

	Create and activate virtual environment
	Create and activate virtual environment:

Prompt To Fix With AI

This is a comment left during a code review.
Path: README.md
Line: 57:57

Comment:
**style:** Missing colon after "Create and activate virtual environment"

```suggestion
Create and activate virtual environment:
```

How can I resolve this? If you propose a fix, please make it concise.