Added logic to handle lib & class declaration

src/parser/model/class_ast.py

@@ -0,0 +1,18 @@
+from parser.abc.ast import AST
+
+from cpl_query.extension.list import List
+
+
+class ClassAST(AST):
+
+    def __init__(self):
+        AST.__init__(self)
+        self._body = List(AST)
+
+    @property
+    def body(self) -> List['AST']:
+        return self._body
+        
+    @body.setter
+    def body(self, value: List['AST']):
+        self._body = value