Initial commit of simple moving average indicator

indicators/sma.py

@@ -0,0 +1,7 @@
+from pandas import DataFrame, Series
+
+def sma(data: DataFrame, period: int = 200) -> Series:
+    """
+    Calculate the simple moving average and return it as a Series.
+    """
+    return data['Close'].rolling(window = period).mean().fillna(0)