populate_price: A function to add historical price data to the corresponding data for each reddit post within the Pandas Dataframe.

[JKelly423]

A function to add historical price data to the corresponding data for each reddit post within the Pandas Dataframe
The dataframe will be declared as an instance variable and will be accessed with self.df .

A row 'Price' will needed to be added to this dataframe as a part of this function.

Params: Pandas Dataframe of Reddit posts.

Returns: True if adding price data is successful, False if error occurs.