Add instructions for flashing with esptool.py (closes #7)

[bessman]

Summary by Sourcery

Documentation:

• Document how to flash the ESP01 firmware using esptool.py.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request adds instructions for flashing the ESP-01 firmware using esptool.py, which is an alternative to using the Arduino IDE. The instructions include how to configure a Raspberry Pi for use with esptool.py, how to connect the ESP-01 to the Raspberry Pi, how to enter the ESP-01 bootloader, and how to flash the firmware.

Sequence diagram for flashing ESP-01 with esptool.py

sequenceDiagram
    participant User as User
    participant RPi as Raspberry Pi
    participant ESP as ESP-01

    Note over User, ESP: Setup Phase
    User->>RPi: Disable Linux serial console
    User->>RPi: Connect ESP-01 to GPIO pins

    Note over User, ESP: Bootloader Phase
    User->>ESP: Pull GPIO_0 low
    User->>ESP: Reset device (pull RESET high briefly)

    Note over User, ESP: Flashing Phase
    User->>RPi: Run esptool.py chip_id
    RPi->>ESP: Check connection
    ESP-->>RPi: Return chip information
    RPi-->>User: Display chip details

    User->>RPi: Run esptool.py write_flash
    RPi->>ESP: Write firmware
    ESP-->>RPi: Confirm write
    RPi-->>User: Display flash results

    Note over User, ESP: Completion Phase
    User->>ESP: Pull GPIO_0 high
    User->>ESP: Reset device
    ESP-->>User: Start broadcasting 'PSLab' SSID

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File-Level Changes

Change	Details	Files
Added instructions for flashing the ESP-01 firmware using esptool.py.	Created a new markdown file with instructions for flashing the ESP-01 firmware using esptool.py. Added instructions for configuring a Raspberry Pi for use with esptool.py. Added instructions for connecting the ESP-01 to the Raspberry Pi. Added instructions for entering the ESP-01 bootloader. Added instructions for flashing the firmware using esptool.py.	docs/esptool.md
Added a link to the new esptool.md documentation in the README.	Added a new section to the README.md file called 'Flashing without Arduino'. Added a link to the new esptool.md documentation in the README.md file.	README.md

Possibly linked issues

• Add instructions for flashing with esptool.py #7: The PR adds instructions for flashing with esptool.py to the README and creates a new file with detailed instructions.

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[sourcery-ai]

Hey @bessman - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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