Adding pySimpleGEIM

[mahmudulh-tamim]

This pull request adds the pySimpleGEIM.py module, which can run GEIM à la Ragusa on the snapshot matrix obtained from a snapshot_matrix_builder object (see PR #20).

Location: src/python/GEIM/

The module contains two classes that can be imported as follows:

from pySimpleGEIM import pyGEIM_offline, pyGEIM_online

Offline Phase
An object of the offline class can be instantiated as:

geim_offline = pyGEIM_offline(snaps_obj=sm_builder_obj, rank=40, list_observable_fields=obs_fields)

After instantiation, run the algorithm:

geim_offline.run_algorithm()

Once the algorithm completes, the object contains the basis functions, sensor locations, and system matrix.
Online Phase
The online class can then be instantiated (requires a completed offline object):

geim_online = pyGEIM_online(offline_object=geim_offline, snaps_object=sm_builder_obj)