vscode設置終端主題，設置終端選中顏色

vscode定義主題色官網：
https://code.visualstudio.com/api/references/theme-color#integrated-terminal-colors

問題：
  終端選中顏色和終端背景顏色一致時，不能顯示出光標選中的內容，並且網上搜索了各種主題設置，沒有提到終端選中屬性的顏色

解決：
  通過查找vscode官方資料，找到terminal.selectionBackground屬性，可以通過調整terminal.selectionBackground屬性，設置終端選中內容的顏色

完整終端屬性：
  terminal.background: The background of the Integrated Terminal's viewport.
  terminal.border: The color of the border that separates split panes within the terminal. This defaults to panel.border.
  terminal.foreground: The default foreground color of the Integrated Terminal.
  terminal.ansiBlack: 'Black' ANSI color in the terminal.
  terminal.ansiBlue: 'Blue' ANSI color in the terminal.
  terminal.ansiBrightBlack: 'BrightBlack' ANSI color in the terminal.
  terminal.ansiBrightBlue: 'BrightBlue' ANSI color in the terminal.
  terminal.ansiBrightCyan: 'BrightCyan' ANSI color in the terminal.
  terminal.ansiBrightGreen: 'BrightGreen' ANSI color in the terminal.
  terminal.ansiBrightMagenta: 'BrightMagenta' ANSI color in the terminal.
  terminal.ansiBrightRed: 'BrightRed' ANSI color in the terminal.
  terminal.ansiBrightWhite: 'BrightWhite' ANSI color in the terminal.
  terminal.ansiBrightYellow: 'BrightYellow' ANSI color in the terminal.
  terminal.ansiCyan: 'Cyan' ANSI color in the terminal.
  terminal.ansiGreen: 'Green' ANSI color in the terminal.
  terminal.ansiMagenta: 'Magenta' ANSI color in the terminal.
  terminal.ansiRed: 'Red' ANSI color in the terminal.
  terminal.ansiWhite: 'White' ANSI color in the terminal.
  terminal.ansiYellow: 'Yellow' ANSI color in the terminal.
  terminal.selectionBackground: The selection background color of the terminal.