Gendo diffuser training devcontainer

Setup devcontainers in a fresh VM and train :hugging_face: Hugging Face sdxl example.

## Overview

Files added from the examples:

1. .devcontainer/devcontainer.json is the key file that describes the devcontainer for VS code.
2. setup-env.sh creates the python env with venv and installs the python dependencies
3. examples/text_to_image/train-sdxl.sh just calls the instructions from the original examples/text_to_image/README_sdxl.md

Setup

1. Download repo and cd into it git clone github.com/gee-gendo/diffusers-dev-container
2. In VS code, Reopen with dev container. Install the extension if needed.

cmd + shift + P
Reopen in container
You can click show logs to follow the build

3. Run setup script

# Setup python env and dependencies
./setup-env.sh

6. Select python interpreter (in .venv folder).
7. Run training script

cd examples/text_to_image
./train-sdxl.sh

You can then check the logs to confirm everything is running. GPU usage available as usual with the nvidia-smi cli.