Add vesting owner and recipient guides with step-by-step instructions

[obscureozy]

Description

This update adds the vesting wallet user manuals (owner and recipient), clarifies key concepts, and provides step-by-step instructions.

Changes Implemented:

• Added two manuals (under v3/guidelines/dapps/tutorials/vesting-examples) :
  • vesting-owner-guide
  • vesting-recipient-guide
• Added a "What is Vesting?" introduction to the "vesting-owner-guide" section to introduce key concepts.
• Added screenshots for the relevant steps.
• Used clear and simple instructions to ensure a seamless user experience.
• Maintained links to relevant documentation and blockchain explorers.

Closes (#1041)

Checklist

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