Brief introduction on network/graph

[ArdtK]

Ra2ce version checks

• I have checked that the issue still exists on the latest version of the docs in master here.

Kind of issue

Documentation is missing

Location of the documentation

https://deltares.github.io/ra2ce/network_module/network_module.html

Documentation problem

Current documentation is not complete.

Suggested fix for documentation

Add concise documentation on:

• What is a network
• What is an hazard overlay
• What is a graph
• What is a multi- and di-graph
• Which sources are available for which type (OSM, etc)
• Which is used when (Damages, Losses)
• Which files are involved (.p, .csv, etc)

N.B.: The link in the issue template doesn't exist.