Added an example notebook for image snips.

packages/python/docs/_static/custom.css

packages/python/docs/_templates/class.rst

packages/python/docs/_templates/module.rst

packages/python/docs/cli.md

packages/python/docs/cli/snippets.md

packages/python/docs/cli/token.md

packages/python/docs/conf.py

packages/python/docs/references.md

packages/python/docs/snippets.md

packages/python/docs/snippets/.sniprc

packages/python/docs/snippets/image.ipynb

packages/python/docs/snippets/test.png

packages/python/pyproject.toml

packages/python/src/snip/api/__init__.py

packages/python/src/snip/snippets/base.py

packages/python/src/snip/snippets/image.py

packages/python/src/snip/snippets/text.py

packages/python/tests/test_snippets.py