Add Docstrings

[haxdds]

Is there an existing issue for this?

• I have searched the existing issues

Is your feature request related to a problem? Please describe.

Having docstrings for all methods and classes will help new contributors understand the codebase and also provide a method of autogenerated API docs. Right now only some methods and classes have docstrings.

Describe the solution you'd like.

Example of already implemented docstring.

def get_aggs(self,
                 symbol: str,
                 multiplier: int,
                 timespan: str,
                 _from: str,
                 to: str) -> Aggs:
        """
        :param symbol: str eg AAPL
        :param multiplier: must be 1
        :param timespan: day or minute
        :param _from: yyyy-mm-dd
        :param to: yyyy-mm-dd
        :return:
        """
        resp = self.data_get('/aggs/ticker/{}/range/{}/{}/{}/{}'.format(
            symbol, multiplier, timespan, _from, to
        ))
        return self.response_wrapper(resp, Aggs)

Describe an alternate solution.

No response

Anything else? (Additional Context)

No response