Add guide in serverless section with function template example

[jenglick]

URL, if applicable

No response

Describe the new content you are requesting.

A guide in the serverless section showing an example of building a function template using hamiltonian simulation and qiskit addons as context

cc @pandasa123

If this new content request is accepted, do you want to write the content?

I will write a draft of the proposed content

[garrison]

I expect to open a PR that closes this issue shortly, possibly as soon as tomorrow.