Add graph view

Frontend/src/Api.js

@@ -141,6 +141,11 @@ export function FetchTree(RootName, RelativePath) {
   return FetchJson(`/tree?${Params}`);
 }
 
+export function FetchGraph(RootName, RelativePath) {
+  const Params = new URLSearchParams({ Root: RootName, Path: RelativePath });
+  return FetchJson(`/graph?${Params}`);
+}
+
 export function FetchFile(RootName, RelativePath) {
   const Params = new URLSearchParams({ Root: RootName, Path: RelativePath });
   return FetchText(`/file?${Params}`);