Gamma ray packet documentation

[CePowers]

📝 Description

Type: 📝 documentation

I created a new file to start the gamma ray packet source documentation. Within the file I added a section for the packet initialization with basic descriptions of the properties of the packets.

🚦 Testing

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• My changes can't be tested (explain why)

☑️ Checklist

• I requested two reviewers for this pull request
• I updated the documentation according to my changes
• I built the documentation by applying the build_docs label

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[CePowers]

Updating the documentation in a .rst file.