Change README to markdown

It already had some markdown in it and wasn't being rendered correctly

README.md

@@ -0,0 +1,41 @@
+# Koordinates Python API Client
+
+A BSD-licensed Python client library for a number of [Koordinates](https://koordinates.com) web APIs.
+
+The library provides easy access to Koordinates web services, particularly the [Publisher Admin APIs](https://help.koordinates.com/api/publisher-admin-api/).
+
+[![Build status](https://badge.buildkite.com/5ce9ace71272791038722b9443fd4bb23620aec8041c10ea46.svg?branch=master)](https://buildkite.com/koordinates/python-client)
+
+## Installation
+
+To install the latest stable release of the library, simply:
+
+```
+pip install -U koordinates
+```
+
+The library is compatible with Python 3.4+.
+
+
+## Documentation
+
+* [Documentation for the Python library](http://koordinates-python.readthedocs.org)
+* [Documentation on the APIs and available actions](https://help.koordinates.com/api/publisher-admin-api/)
+
+
+## Support & Contributions
+
+Please report bugs as [Github issues](https://github.com/koordinates/python-client/issues). For general technical support for the APIs and libraries, please contact us via [support.koordinates.com](https://support.koordinates.com).
+
+We welcome contributions as pull requests - please open a new issue to start a discussion around a feature idea or bug. See the [Contributing notes](http://koordinates-python.readthedocs.org/en/latest/user/contributing.html) for more details.
+
+## Code formatting
+
+We use [Black](https://github.com/psf/black) to ensure consistent code formatting. We recommend integrating black with your editor:
+
+* Sublime Text: install [sublack](https://packagecontrol.io/packages/sublack) via Package Control
+* VSCode [instructions](https://code.visualstudio.com/docs/python/editing#_formatting)
+
+We use the default settings.
+
+One easy solution is to install [pre-commit](https://pre-commit.com), run `pre-commit install --install-hooks` and it'll automatically validate your changes code as a git pre-commit hook.

setup.py

@@ -15,7 +15,7 @@
     version = re.search(
         r'^__version__\s*=\s*[\'"]([^\'"]*)[\'"]', fd.read(), re.MULTILINE
     ).group(1)
-with open("README.rst", "r", "utf-8") as f:
+with open("README.md", "r", "utf-8") as f:
     readme = f.read()
 
 setup(
@@ -24,6 +24,7 @@
     version=version,
     description="A Python client library for a number of Koordinates web APIs",
     long_description=readme,
+    long_description_content_type="text/markdown",
     author="Koordinates Limited",
     author_email="support@koordinates.com",
     url="https://github.com/koordinates/python-client",