Add documentation strings to all functions<Summarize the feature and how it should work>

[monroews]

The documentation string at the beginning of each function needs to include the function inputs. This is because it is this documentation that pops up in Colab and Colab no longer shows the function call with the list of inputs. See Numpy for an example of a well documented function with defined inputs.

I suggest going through all aguaclara functions and adding this documentation.