Added Parser

- can parse a basic token list to an AST

Compiler/Parser/Nodes/ReturnNode.cs

@@ -0,0 +1,12 @@
+namespace Compiler.Parser.Nodes
+{
+    public sealed class ReturnNode : Node
+    {
+        public override NodeType NodeType { get; set; }
+
+        public ReturnNode()
+        {
+            this.NodeType = NodeType.StatementNode;
+        }
+    }
+}