Add package metadata to setup.py (openai#315)

Add project summary, license, etc. for display with
"pip show" and similar Python package distribution tools.

setup.py

@@ -7,8 +7,12 @@
  name="whisper",
  py_modules=["whisper"],
  version="1.0",
- description="",
+ description="Robust Speech Recognition via Large-Scale Weak Supervision",
+ readme="README.md",
+ python_requires=">=3.7",
  author="OpenAI",
+ url="https://github.com/openai/whisper",
+ license="MIT",
  packages=find_packages(exclude=["tests*"]),
  install_requires=[
  str(r)