Starting to work on Python documentation.

source/python/README.md

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+# astronomy
+
+## Time
+```python
+Time(self, ut)
+```
+Represents a date and time used for performing astronomy calculations.
+
+## Observer
+```python
+Observer(self, latitude, longitude, height=0)
+```
+Represents the geographic location of an observer on the surface of the Earth.
+