feat: Adding general description of attendee form

[kushthedude]

Fixes #3189

Short description of what this resolves:

• Added Description about Attendee Form

Checklist

• I have read the Contribution & Best practices Guide.
• My branch is up-to-date with the Upstream development branch.
• The acceptance, integration, unit tests and linter pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

[kushthedude]

@mariobehling Please have a look, If this looks alright.

[kushthedude]

@niranjan94 @CosmicCoder96 Please Review

[kushthedude]

@CosmicCoder96 Please REview