Add response time badge and chart

vendor/github.com/wcharczuk/go-chart/v2/value_provider.go

@@ -0,0 +1,51 @@
+package chart
+
+import "github.com/wcharczuk/go-chart/v2/drawing"
+
+// ValuesProvider is a type that produces values.
+type ValuesProvider interface {
+	Len() int
+	GetValues(index int) (float64, float64)
+}
+
+// BoundedValuesProvider allows series to return a range.
+type BoundedValuesProvider interface {
+	Len() int
+	GetBoundedValues(index int) (x, y1, y2 float64)
+}
+
+// FirstValuesProvider is a special type of value provider that can return it's (potentially computed) first value.
+type FirstValuesProvider interface {
+	GetFirstValues() (x, y float64)
+}
+
+// LastValuesProvider is a special type of value provider that can return it's (potentially computed) last value.
+type LastValuesProvider interface {
+	GetLastValues() (x, y float64)
+}
+
+// BoundedLastValuesProvider is a special type of value provider that can return it's (potentially computed) bounded last value.
+type BoundedLastValuesProvider interface {
+	GetBoundedLastValues() (x, y1, y2 float64)
+}
+
+// FullValuesProvider is an interface that combines `ValuesProvider` and `LastValuesProvider`
+type FullValuesProvider interface {
+	ValuesProvider
+	LastValuesProvider
+}
+
+// FullBoundedValuesProvider is an interface that combines `BoundedValuesProvider` and `BoundedLastValuesProvider`
+type FullBoundedValuesProvider interface {
+	BoundedValuesProvider
+	BoundedLastValuesProvider
+}
+
+// SizeProvider is a provider for integer size.
+type SizeProvider func(xrange, yrange Range, index int, x, y float64) float64
+
+// ColorProvider is a general provider for color ranges based on values.
+type ColorProvider func(v, vmin, vmax float64) drawing.Color
+
+// DotColorProvider is a provider for dot color.
+type DotColorProvider func(xrange, yrange Range, index int, x, y float64) drawing.Color