Participant can submit a move

[git-union-dev]

Description

As a participant, I want to be able to submit my move (rock, paper, or scissors) to the consensus mechanism, so that my decision can be considered in the decision-making process.

Acceptance criteria

• The mechanism should accept valid moves (rock, paper, or scissors) from participants.
• The mechanism should reject invalid moves (not rock, paper, or scissors).
• The submitted move should be recorded and considered for the consensus algorithm.