Write a python function that can simulate and assess the performance of a 4 stock portfolio.

Inputs to the function include:

• Start date
• End date
• Symbols for equities (e.g. GOOG, AAPL, etc...)
• Allocations to the equities at the beginning of the simulation (e.g. 0.2, 0.3, etc...)

The function should return

• Standard deviation of daily returns
• Average daily return
• Sharpe ratio
• Cumulative return