Getting Started should have a reproducible CMake for CPP runner

[mergennachin]

Here's the repro: https://github.com/pytorch-labs/executorch-examples/pull/13/files

Currently, it is saying extension_module_static and optimized_native_cpu_ops_lib not found

[mergennachin]

Let's reference this meta-pytorch/executorch-examples#13 in the README

[mergennachin]

#10022

[mergennachin]

Reminder to myself, cherry-pick

[lucylq]

Link to Module example here: #10026