implement a summary line

For Pony's bot, implement a summary line that just shows the highlights of the log

EDPlayerJournal/Credits.cs

@@ -34,4 +34,16 @@ public class Credits {
 
         return string.Format("{0} CR", amount.ToString("N", format));
     }
+
+    public static string FormatMillions(long amount) {
+        double millions = (amount / 1000000.0);
+
+        if (amount >= 100000) {
+            return string.Format("{0:0.0}M", millions);
+        } else if (amount >= 10000) {
+            return string.Format("{0:0.00}M", millions);
+        }
+
+        return "";
+    }
 }