add a readme

README.md

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+# NAPOTD
+
+## NASA Astronomy Picture of the Day
+
+An API to get the current picture from NASA's astronomy picture of the day website.
+
+-----
+
+Every Day NASA posts a new astronomy-related image on https://apod.nasa.gov/apod/
+
+Unfortunately, that image URL changes, so I cannot point to a single URL and get the current image of the day.
+
+This is my solution.  I created a python web API that returns a 302, redirecting you to the image URL by parsing the
+code of the website to find the `img` tag.
+
+I am using it to update the background of my phone every day with Tasker.  It's nice.
+
+For convenience, I also dockerized it.