feat: support markdown

ui/components/Markdown/context/context.tsx

@@ -0,0 +1,15 @@
+import React from "react";
+import type { ReactMarkdownViewModel } from "./viewmodel";
+
+export interface INodeRendererContext {
+  readonly viewmodel: ReactMarkdownViewModel;
+}
+
+export const NodeRendererContextType = React.createContext<INodeRendererContext>(
+  null as unknown as INodeRendererContext,
+);
+NodeRendererContextType.displayName = "NodeRendererContextType";
+
+export const useNodeRendererContext = (): INodeRendererContext => {
+  return React.useContext(NodeRendererContextType);
+};