TUN-3201: Create base cloudflared UI structure

vendor/github.com/rivo/tview/styles.go

@@ -0,0 +1,35 @@
+package tview
+
+import "github.com/gdamore/tcell"
+
+// Theme defines the colors used when primitives are initialized.
+type Theme struct {
+	PrimitiveBackgroundColor    tcell.Color // Main background color for primitives.
+	ContrastBackgroundColor     tcell.Color // Background color for contrasting elements.
+	MoreContrastBackgroundColor tcell.Color // Background color for even more contrasting elements.
+	BorderColor                 tcell.Color // Box borders.
+	TitleColor                  tcell.Color // Box titles.
+	GraphicsColor               tcell.Color // Graphics.
+	PrimaryTextColor            tcell.Color // Primary text.
+	SecondaryTextColor          tcell.Color // Secondary text (e.g. labels).
+	TertiaryTextColor           tcell.Color // Tertiary text (e.g. subtitles, notes).
+	InverseTextColor            tcell.Color // Text on primary-colored backgrounds.
+	ContrastSecondaryTextColor  tcell.Color // Secondary text on ContrastBackgroundColor-colored backgrounds.
+}
+
+// Styles defines the theme for applications. The default is for a black
+// background and some basic colors: black, white, yellow, green, cyan, and
+// blue.
+var Styles = Theme{
+	PrimitiveBackgroundColor:    tcell.ColorBlack,
+	ContrastBackgroundColor:     tcell.ColorBlue,
+	MoreContrastBackgroundColor: tcell.ColorGreen,
+	BorderColor:                 tcell.ColorWhite,
+	TitleColor:                  tcell.ColorWhite,
+	GraphicsColor:               tcell.ColorWhite,
+	PrimaryTextColor:            tcell.ColorWhite,
+	SecondaryTextColor:          tcell.ColorYellow,
+	TertiaryTextColor:           tcell.ColorGreen,
+	InverseTextColor:            tcell.ColorBlue,
+	ContrastSecondaryTextColor:  tcell.ColorDarkCyan,
+}