add readme to GH API lesson

Author: bbelderbos

days/61-63-github-api/README.md

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+# Using Python + Github API¶
+
+Welcome to this lesson. I prepared [a notebook](https://github.com/talkpython/100daysofcode-with-python-course/blob/master/days/61-63-github-api/github-api.ipynb) so you can follow along.
+
+## Day 1: Exploring the PyGithub module
+
+In this lesson I will show you how to use [PyGithub](https://github.com/PyGithub/PyGithub) to retrieve public data from Github profiles. Secondly I will show you how to automatically create a gist.
+
+Today you follow along with the videos and my notebook.
+
+## Day 2 and 3: Practice
+
+Now you got the basics down, it's time to start using the Github API with Python yourself, some ideas for projects to work on you can find [in my notebook](https://github.com/talkpython/100daysofcode-with-python-course/blob/master/days/61-63-github-api/github-api.ipynb).
+
+You can use PyGithub or any other wrapper module, as long as you use Python :)
+
+## Time to share what you've accomplished!
+
+Be sure to share your last couple of days work on Twitter or Facebook. Use the hashtag **#100DaysOfCode**.
+
+Here are [some examples](https://twitter.com/search?q=%23100DaysOfCode) to inspire you. Consider including [@talkpython](https://twitter.com/talkpython) and [@pybites](https://twitter.com/pybites) in your tweets.
+
+See a mistake in these instructions? Please [submit a new issue](https://github.com/talkpython/100daysofcode-with-python-course/issues) or fix it and [submit a PR](https://github.com/talkpython/100daysofcode-with-python-course/pulls).