[cons_smooth] Improvement Suggestions

[HumphreyYang]

Code

• crea_cs_model -> create_cs_model
• Add comments to parameters in the namedtuple
• Fix the default values and add error handling for invalid values when defining the namedtuple.

Content

• quantecon -> QuantEcon
• Give definitions and economic intuitions in the context of the model
• Define "candidate consumption path"
• Give explanations of the welfare criterion formula
• Link the formula for the geometric model (potentially splitting the geometric lecture)
• Change $\mathbf{R}^t$ to $\mathbf{\beta}^t$ (suggest it to Tom)
• Give explanations and intuitions for the experiments -- "consumption smoothing happens in different cases"
• Explain why studying admissible consumption path variation is important
• "variation variation" -> "variation"
• Describe plots and what are the insights of the plots.