feat(write): Add content nodes support

src/write/nodes/root_node.cr

@@ -0,0 +1,46 @@
+
+require "./module"
+
+module DocMachine::Write::Nodes
+  class RootNode
+    property context : String = ""
+    property audience : String = ""
+    property goals : String = ""
+    property constraints : String = ""
+    property chapters = [] of ChapterNode
+
+    def build_chapters()
+      [] of ChapterNode
+    end
+  end
+
+  class ChapterNode
+    property sections = [] of SectionNode
+
+    def build_sections()
+      [] of SectionNode
+    end
+  end
+
+  class SectionNode
+    property subsections = [] of SubsectionNode
+
+    def build_subsections()
+      [] of SubsectionNode
+    end
+  end
+
+  class SubsectionNode
+    property content = [] of String
+
+    def build_content()
+      [] of String
+    end
+
+    def fix_content()
+      [] of String
+    end
+  end
+end
+
+