Added Data Organisation Section to Docs

[DrNickClarke]

Docs only

[athakur91]

Looks good Nick, have added a few comments in line

[ms041223]

For the second and third points in the "Data Update Process" section, its missing capital letters.

• Delivery format (the format that the data source uses) vs storage format of the data. The trade-offs are
• storing data in a format close to delivery format makes it easier to reconcile with the source
• the delivery format is often not the best format for downstream processes
• Frequency of data updates
• Storage growth characteristics over time
• System performance over time

[ms041223]

It is really good and will be super useful. Hopefully, this answers many of the questions we have been getting.