Implemented MoneyFlowIndexVisitor visitor

Author: hosseinmoein

docs/HTML/DataFrame.html

@@ -1875,6 +1875,10 @@ <H2 ID="2"><font color="blue">API Reference with code samples <font size="+4">&#
       <td title="Calculates moving average convergence/divergence oscillator"><a href="https://hosseinmoein.github.io/DataFrame/docs/HTML/MACDVisitor.html">MACDVisitor</a>{}</td>
     </tr>
 
+    <tr class="item" onmouseover="this.style.backgroundColor='#ffff66';" onmouseout="this.style.backgroundColor='#d4e3e5';">
+      <td title="Calculates money flow oscillator"><a href="https://hosseinmoein.github.io/DataFrame/docs/HTML/MoneyFlowIndexVisitor.html">MoneyFlowIndexVisitor</a>{}</td>
+    </tr>
+
     <tr class="item" onmouseover="this.style.backgroundColor='#ffff66';" onmouseout="this.style.backgroundColor='#d4e3e5';">
       <td title="Calculates rolling Percentage Price Oscillator"><a href="https://hosseinmoein.github.io/DataFrame/docs/HTML/PercentPriceOSCIVisitor.html">PercentPriceOSCIVisitor</a>{}</td>
     </tr>