Create Visualization of trading performance

[CodeBeckZero]

Visualization of Trading Performance:

• Plot Stock price vs time step
• Label each buy action with green up arrow
• Label each sell action with red down arrow
• Highlight background green during positive trade (buy action/price < then subsequent sell action/price)
• Highlight background red during negative trade (buy action/price > then subsequent sell action/price)
• No background highlight when out of the market

Performance DataFrame

• Cumulative Return
• Annualized Return
• Sharpe Ratio
• Maximum Drawdown
• number of loss trades
• number of win trades
• Win Ratio

[CodeBeckZero]

Finished, need to add maximum drawdown and annualized return to agentperfm.py

[CodeBeckZero]

ISSUE: Trade statistics count the number of trades, not the number of buy-sell groupings.