Add candlestick chart type

candlestick_chart.py

@@ -0,0 +1,23 @@
+from chart import Chart
+from pandas import Series
+from plotly.graph_objects import Candlestick
+
+class CandlestickChart(Chart):
+
+    def __init__(self, x: Series, opens: Series, highs: Series, lows: Series, closes: Series):
+        self.x = x
+        self.opens = opens
+        self.highs = highs
+        self.lows = lows
+        self.closes = closes
+
+    def trace(self) -> Candlestick:
+        return Candlestick(
+            x = self.x, 
+            open = self.opens, 
+            high = self.highs, 
+            low = self.lows, 
+            close = self.closes, # TODO: Make colors configurable.
+            increasing = dict(line = dict(color = 'limegreen', width = 1), fillcolor = 'limegreen'),
+            decreasing = dict(line = dict(color = 'red', width = 1), fillcolor = 'red')
+        )