Creates a new comment for the specified solar installation project.

Business Context:
Comments provide a communication channel for project stakeholders including
customers, sales representatives, installers, dealers, and project managers
to discuss project progress, coordinate activities, and document important information.

Common Use Cases:

• Customer feedback and requests
• Installation progress updates
• Design change discussions
• Issue reporting and resolution
• Milestone completion notes
• Communication between project team members

After Creation:

• Comment is immediately visible to all users with access to the project
• Comment creation is logged in the project's activity timeline
• Relevant stakeholders may receive notifications (depending on system configuration)
• Comments contribute to the project's communication audit trail