Update README.md (#11)

Author: markmcd

README.md

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-This is a repo for the generative language client library.
+Google Generative AI Python Client
+==================================
+
+[![PyPI version](https://badge.fury.io/py/google-generativeai.svg)](https://badge.fury.io/py/google-generativeai)
+![PyPI - Downloads](https://img.shields.io/pypi/dd/google-generativeai)
+
+Get started using the PaLM API in Python. Check out the [developer site](https://developers.generativeai.google/)
+for comprehensive documentation.
+
+## Installation and usage
+
+Install from PyPI.
+```bash
+pip install google-generativeai
+```
+
+Get an [API key from MakerSuite](https://makersuite.google.com/app/apikey), then configure it here.
+```python
+import google.generativeai as palm
+
+palm.configure(api_key=os.environ['PALM_API_KEY'])
+```
+
+Use the `palm.chat` function to have a discussion with a model.
+```python
+response = palm.chat(messages=["Hello."])
+print(response.last) #  'Hello! What can I help you with?'
+response.reply("Can you tell me a joke?")
+```
+
+## Documentation
+
+Checkout the full [API docs](https://developers.generativeai.google/api), the [guide](https://developers.generativeai.google/guide) and [quick starts](https://developers.generativeai.google/tutorials).
+
+## Colab magics
+
+Once installed, use the Python client via the `%%palm` Colab magic. Read the full guide [here](https://developers.generativeai.google/tools/notebook_magic).
+
+```python
+%%palm
+The best thing since sliced bread is
+```