asyncio_micro: Add metadata.

asyncio_micro/metadata.txt

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+srctype = micropython-lib
+type = module
+version = 0.5
+author = Paul Sokolovsky
+long_desc = Lightweight asyncio-like library built around native Python coroutines, not around un-Python devices like callback mess.
+depends = heapq, errno, select, logging

asyncio_micro/setup.py

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+import sys
+# Remove current dir from sys.path, otherwise setuptools will peek up our
+# module instead of system.
+sys.path.pop(0)
+from setuptools import setup
+
+
+setup(name='micropython-asyncio_micro',
+      version='0.5',
+      description='asyncio_micro module for MicroPython',
+      long_description='Lightweight asyncio-like library built around native Python coroutines, not around un-Python devices like callback mess.',
+      url='https://github.com/micropython/micropython/issues/405',
+      author='Paul Sokolovsky',
+      author_email='micro-python@googlegroups.com',
+      maintainer='MicroPython Developers',
+      maintainer_email='micro-python@googlegroups.com',
+      license='MIT',
+      py_modules=['asyncio_micro'],
+      install_requires=['micropython-heapq', 'micropython-errno', 'micropython-select', 'micropython-logging'])