feat: add example for starlette.io (#72)

* feat: add example for starlette.io

* feat: link additional documentation

* feat: dev hot reload docker command

examples/starlette/.gitignore

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+
+# Created by https://www.toptal.com/developers/gitignore/api/python
+# Edit at https://www.toptal.com/developers/gitignore?templates=python
+
+### Python ###
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+pip-wheel-metadata/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.nox/
+.coveage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+*.py,cover
+.hypothesis/
+.pytest_cache/
+pytestdebug.log
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+db.sqlite3
+db.sqlite3-journal
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+doc/_build/
+
+# PyBuilder
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# IPython
+profile_default/
+ipython_config.py
+
+# pyenv
+.python-version
+
+# pipenv
+#   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
+#   However, in case of collaboration, if having platform-specific dependencies or dependencies
+#   having no cross-platform support, pipenv may install dependencies that don't work, or not
+#   install all needed dependencies.
+#Pipfile.lock
+
+# PEP 582; used by e.g. github.com/David-OConnor/pyflow
+__pypackages__/
+
+# Celery stuff
+celerybeat-schedule
+celerybeat.pid
+
+# SageMath parsed files
+*.sage.py
+
+# Environments
+.env
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+pythonenv*
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+.dmypy.json
+dmypy.json
+
+# Pyre type checker
+.pyre/
+
+# pytype static type analyzer
+.pytype/
+
+# profiling data
+.prof
+
+# Virtualenv
+# http://iamzed.com/2009/05/07/a-primer-on-virtualenv/
+.Python
+[Bb]in
+[Ii]nclude
+[Ll]ib
+[Ll]ib64
+[Ll]ocal
+[Ss]cripts
+pyvenv.cfg
+.venv
+pip-selfcheck.json
+
+
+# End of https://www.toptal.com/developers/gitignore/api/python

examples/starlette/Dockerfile

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+FROM tiangolo/uvicorn-gunicorn:python3.8-alpine3.10
+
+LABEL maintainer="Sebastian Ramirez <tiangolo@gmail.com>"
+
+RUN pip install --no-cache-dir starlette
+
+COPY ./app /app

examples/starlette/README.md

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+# Python Starlette Example
+
+This is a [Starlette](https://www.starlette.io/) app that serves a simple JSON response.
+
+[![Deploy on Railway](https://railway.app/button.svg)](https://railway.app/new?template=https%3A%2F%2Fgithub.com%2Frailwayapp%2Fexamples%2Ftree%2Fmaster%2Fexamples%2Fstarlette)
+
+## ✨ Features
+
+- Python
+- Starlette
+
+## 💁‍♀️ How to use
+- Build the docker image `docker build -t railway .`
+- Start the container `docker run -d --name railway-test -p 80:80 railway`
+- For auto restart in development `docker run -d -p 80:80 -v $(pwd):/app railway /start-reload.sh`
+
+Note: Advance users may refer to [this](https://github.com/tiangolo/uvicorn-gunicorn-starlette-docker)

examples/starlette/app/main.py

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+from starlette.applications import Starlette
+from starlette.responses import JSONResponse
+from starlette.routing import Route
+
+
+async def homepage(request):
+    return JSONResponse({"Choo Choo": "Welcome to your Starlette app 🚅"})
+
+
+app = Starlette(debug=True, routes=[
+    Route('/', homepage),
+])