refactor structs to records, add new classes for financial calculations, implement EMA and SMA with circular buffer. Generate random financial data using GBM model. Also, test the SMA calculation with sample data.

v2/Indicators/SMA.cs

@@ -0,0 +1,53 @@
+namespace QuanTAlib;
+
+public class SMA
+{
+    private CircularBuffer buffer = null!;
+    private int period;
+    private double sum;
+    public TValue Value { get; private set; }
+    public bool IsHot { get; private set; }
+
+    public SMA(int period)
+    {
+        Init(period);
+    }
+
+    public void Init(int period)
+    {
+        this.period = period;
+        this.buffer = new CircularBuffer(period);
+        this.sum = 0;
+        this.IsHot = false;
+        this.Value = default;
+    }
+
+    public TValue Update(TValue input, bool IsNew = true)
+    {
+        if (buffer.Count == 0 || isNew)
+        {
+            if (buffer.Count == period)
+            {
+                sum -= buffer[0];
+            }
+            buffer.Add(input);
+            sum += input.Value;
+        }
+        else
+        {
+            sum -= buffer[buffer.Count - 1];
+            sum += input.Value;
+            buffer[buffer.Count - 1] = input;
+        }
+
+        double sma = sum / buffer.Count;
+        Value = new TValue(input.Time, sma, isNew, IsHot);
+        return Value;
+        }
+
+        double sma = buffer.Count > 0 ? sum / buffer.Count : double.NaN;
+        IsHot = buffer.Count >= period;
+        Value = new TValue(input.Time, sma, IsNew, IsHot);
+        return Value;
+    }
+}