Start of new ANTLR4 based parser.

Very simple tests pass.

pglablib/sqlast/CreateTable.h

@@ -0,0 +1,21 @@
+#pragma once
+
+#include "Statement.h"
+#include <memory>
+
+namespace sqlast {
+
+class ColumnDefinition;
+class TableConstraint;
+
+class CreateTable: public Statement
+{
+public:
+    CreateTable();
+
+private:
+
+
+};
+
+}