[docs] Creating and training new model

[fcdl94]

This is assuming that the model has been already created, which is not often the case (especially if we're in a getting started).

I'd propose to change from this

from focoos.ports import Hyperparameters, TrainInstance

model = focoos.get_remote_model("<YOUR-MODEL-ID>")

res = model.train(
    anyma_version="0.11.1",
    dataset_ref="<YOUR-DATASET-ID>",
    instance_type=TrainInstance.ML_G4DN_XLARGE,
    volume_size=50,
    max_runtime_in_seconds=36000,
    hyperparameters=Hyperparameters(
        learning_rate=0.0001,
        batch_size=16,
        max_iters=1500,
        eval_period=100,
        resolution=640,
    ),  # type: ignore
)
pprint(res)

to

from focoos.ports import Hyperparameters, TrainInstance

model = focoos.new_model(name = "model_name", focoos_model='', description="")

res = model.train(
    anyma_version="0.11.1",
    dataset_ref="<YOUR-DATASET-ID>",
    instance_type=TrainInstance.ML_G4DN_XLARGE,
    volume_size=50,
    max_runtime_in_seconds=36000,
    hyperparameters=Hyperparameters(
        learning_rate=0.0001,
        batch_size=16,
        max_iters=1500,
        eval_period=100,
        resolution=640,
    ),  # type: ignore
)
pprint(res)