Add get started skill for messenger bots

[Pittu-Sharma]

Fixes #255

Adds a "get started" / welcome skill for messenger bots
to trigger an initial welcome message when users start
chatting with SUSI.

Summary by Sourcery

New Features:

• Introduce a dedicated get-started skill definition for Messenger-based SUSI bots to provide an initial welcome interaction.

[sourcery-ai]

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[sourcery-ai]

Hey - I've left some high level feedback:

• The new get_started.txt file is added but appears empty in the diff; please ensure it contains the actual welcome skill content and follows the standard metadata/header format used by other skills in models/general/Communication/en.
• Consider explicitly defining the phrases or triggers that should activate this "get started" skill so it doesn't conflict with or get overshadowed by other existing welcome or greeting skills.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- The new `get_started.txt` file is added but appears empty in the diff; please ensure it contains the actual welcome skill content and follows the standard metadata/header format used by other skills in `models/general/Communication/en`.
- Consider explicitly defining the phrases or triggers that should activate this "get started" skill so it doesn't conflict with or get overshadowed by other existing welcome or greeting skills.

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