Hmm, yes, it says "Build your own dashboard for store managers, field techs, or unique use cases", what that means is it is giving you API access to replicate many (but not all) features of Dashboard as you choose, but you have to build it from scratch.
The API documentation is here...
https://developer.cisco.com/meraki/api-v1/#!introduction/meraki-dashboard-api
To merely create a network, you can use...
https://developer.cisco.com/meraki/api-v1/#!create-organization-network
But I'd think you'd want to do more than that, assign and configure devices etc., which probably will involve many other API calls.
Step one is to get a precise definition of what you want to do, there may be examples you can adapt.
Using the Meraki Python library can simplify things as it does the low-level stuff for you...
https://github.com/meraki/dashboard-api-python
But if you want a 'Dashboard', i.e. a web-based GUI, you'd have to develop that from scratch or use a library/builder, (there are many, including Python ones), as creating a user-interface is not part of the Meraki API.
