Add README.md.

Author: nyergler

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README.md

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+# Polytomic Python Library
+
+[![pypi](https://img.shields.io/pypi/v/polytomic)](https://pypi.python.org/pypi/polytomic)
+
+The Polytomic Python library provides convenient access to the Polytomic API from Python.
+
+## Installation
+
+```sh
+pip install polytomic
+```
+
+## Usage
+
+Instantiate and use the client with the following:
+
+```python
+from polytomic import BulkSchedule
+from polytomic.client import Polytomic
+
+client = Polytomic(
+    token="YOUR_TOKEN",
+)
+client.bulk_sync.create(
+    destination_connection_id="248df4b7-aa70-47b8-a036-33ac447e668d",
+    mode="replicate",
+    name="My Bulk Sync",
+    schedule=BulkSchedule(
+        frequency="manual",
+    ),
+    source_connection_id="248df4b7-aa70-47b8-a036-33ac447e668d",
+)
+```
+
+## Async Client
+
+The SDK also exports an `async` client so that you can make non-blocking calls to our API.
+
+```python
+from polytomic import BulkSchedule
+from polytomic.client import AsyncPolytomic
+
+client = AsyncPolytomic(
+    token="YOUR_TOKEN",
+)
+await client.bulk_sync.create(
+    destination_connection_id="248df4b7-aa70-47b8-a036-33ac447e668d",
+    mode="replicate",
+    name="My Bulk Sync",
+    schedule=BulkSchedule(
+        frequency="manual",
+    ),
+    source_connection_id="248df4b7-aa70-47b8-a036-33ac447e668d",
+)
+```
+
+## Contributing
+
+While we value open-source contributions to this SDK, this library is generated programmatically.
+Additions made directly to this library would have to be moved over to our generation code,
+otherwise they would be overwritten upon the next generated release. Feel free to open a PR as
+a proof of concept, but know that we will not be able to merge it as-is. We suggest opening
+an issue first to discuss with us!
+
+On the other hand, contributions to the README are always very welcome!