Moved formating state to the base class

src/Stateless/Graph/GraphStyleBase.cs

@@ -48,6 +48,13 @@ public abstract class GraphStyleBase
         /// <returns></returns>
         public abstract string FormatOneDecisionNode(string nodeName, string label);
 
+        /// <summary>
+        /// Returns the formatted text for a initial state.
+        /// </summary>
+        /// <param name="initialStateName"></param>
+        /// <returns></returns>
+        public abstract string FormatInitialState(string initialStateName);
+
         /// <summary>
         /// Returns the formatted text for all the transitions found in the state graph.
         /// This form, which can be overridden, determines the type of each transition and passes the appropriate

src/Stateless/Graph/UmlDotGraphStyle.cs

@@ -122,5 +122,20 @@ internal string FormatOneLine(string fromNodeName, string toNodeName, string lab
         {
             return $"\"{fromNodeName}\" -> \"{toNodeName}\" [style=\"solid\", label=\"{label}\"];";
         }
+
+        /// <summary>
+        /// Generate the text for a initial state
+        /// </summary>
+        /// <param name="initialStateName">Name of state</param>
+        /// <returns></returns>
+        public override string FormatInitialState(string initialStateName)
+        {
+            string f = System.Environment.NewLine + $" init [label=\"\", shape=point];";
+            f += System.Environment.NewLine + $" init -> \"{initialStateName}\"[style = \"solid\"]";
+
+            f += System.Environment.NewLine + "}";
+
+            return f;
+        }
     }
 }