implement initial basic ast

src/main/java/util/ast/AST.java

@@ -0,0 +1,28 @@
+package util.ast;
+
+public class AST {
+
+    private final Node root;
+
+    public AST(Node root) {
+        this.root = root;
+    }
+
+    public Node getRoot() {
+        return this.root;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (obj instanceof AST) {
+            return this.root.equals(((AST) obj).root);
+        }
+
+        return false;
+    }
+
+    @Override
+    public String toString() {
+        return this.root.toString();
+    }
+}