feat: added documentation for RoboticArm

[rahul31124]

• Please check if the PR fulfills these requirements

• The commit message follows our guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)

• Bug fix
• Feature implementation
• Doc updates

• What changes have you introduced?
  Added Documentation for Robotic Arm

• Does this PR introduce a breaking change?
  No

Summary by Sourcery

Add a comprehensive tutorial for using and programming a 4-DoF robotic arm with the PSLab device, covering servo control via PWM, hardware setup, app usage, timeline CSV interoperability, and example Python code.

Documentation:

• Provide an introduction to robotic arms and servo control with PSLab PWM outputs.
• Detail hardware requirements, wiring instructions, and an external power safety note.
• Document PSLab app usage for manual servo control, timeline creation, playback, and CSV import/export.
• Include a Python example using pslab-python to generate, export, and import servo movement timelines.
• Embed images and video links to illustrate hardware connections and the app interface.

[sourcery-ai]

Reviewer's Guide

This PR introduces a comprehensive tutorial for the Robotic Arm feature, transforming a minimal placeholder into a full-fledged guide covering definition, hardware setup, app workflow, code-driven timeline control, and real-world applications.

File-Level Changes

Change	Details	Files
Expanded introduction with Robotic Arm definition and PSLab-specific context	Added “What is a Robotic Arm?” section with mechanical overview Explained servo-based control via PWM signals Detailed PSLab PWM outputs (SQR1–SQR4) and degrees of freedom	tutorials/roboticarm.md
Added usage instructions and wiring setup	Listed hardware requirements (PSLab device, arm kit, wires, power supply) Outlined step-by-step servo wiring and common ground connection Added caution note about using external power supply and embedded component images	tutorials/roboticarm.md
Detailed experiment workflow in the PSLab app	Described app navigation to Robotic Arm and manual control sliders Explained timeline creation with play, pause, reset, frequency adjustments Included interface screenshots and video tutorial links	tutorials/roboticarm.md
Integrated CSV timeline import/export with Python examples	Provided minimal Python script using pslab-python library for timeline generation Showed functions to export to and import from CSV for app interoperability	tutorials/roboticarm.md
Introduced observations and application examples	Added observations on real-time servo movement during playback Listed potential applications like pick-and-place and educational demos	tutorials/roboticarm.md

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[sourcery-ai]

Hey @rahul31124 - I've reviewed your changes and they look great!

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