Physical resource estimation script

[max-radin]

This PR adds a script that reads logical resource estimate solution files and generates physical resource estimate solution files in order to address #45. The generated solution files include algorithm run time, overall run time, number of physical qubits, and some details about the assumed architecture.

Most fields from the LRE solution files are retained, with a few exceptions. Importantly, the solution and solver UUIDs are replaced. The LRE solution and solver UUIDs are recorded however in the logical_resource_estimate_solution_uuid and logical_resource_estimate_solver_uuid fields of solver_details.

Note that for a given task, the script may not be able to find code distances that yield the required overall success rate. In this case the task will still be included in the new solution file, but it will not contain the fields for algorithm run time etc.

Note that the example PRE config uses a physical error rate of 1e-4, which corresponds to the "optimistic" case in arXiv:2011.03494. I chose this value because I wanted to make sure that the example config will successfully generate resource estimates for at least one of the benchmark tasks. I've tested it with planted solution 1 (14 orbitals).

[jp7745]

last night I updated the README and put some content into a separate scripts/README. please move your README updates to the scripts/README file. thanks!

[max-radin]

README now fixed!