Updating ReadMe of ESP32 folder with information

[SayuriYuto]

Related Issue

• Info about the related issue

• [x] Hacktoberfest Participant

• [x] Contributor

Closes: #328

Describe the changes you've made

For the README for ESP32, I have added various info regarding the board and links which may prove to be helpful for the developer when designing any circuitry employing the ESP32.

Type of change

What sort of change have you made:

• [x] Info of ESP32
• [x] Links of documentation
• [x] Pin diagrams
• [x] Specifications
• [x] Installation process for ESP32 in Arduino IDE
• [x] Test run for ESP32
• [x] Links to example code from repo

Link to view the readme.

Checklist:

• [x] My code follows the guidelines of this project.
• [x] I have performed a self-review of my own code.
• [x] I have commented my code, particularly wherever it was hard to understand.
• [x] I have made corresponding changes to the documentation.
• [x] My changes generate no new warnings.
• [x] I have added tests that prove my fix is effective or that my feature works.
• [x] Any dependent changes have been merged and published in downstream modules.

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