ISOM-1147: feat: read folder dto (#154)

* added read folder dto

* Made explicit that the endpoint can read both folder and top level folder content

* Fix typo

apps/studio/src/schemas/folder.ts

@@ -0,0 +1,7 @@
+import { z } from 'zod'
+
+export const readFolderOrTopLevelFolderSchema = z.object({
+    // Null resourceId indicates reading of top level folder in a site.
+    siteId: z.string(),
+    resourceId: z.string().nullable()
+})

apps/studio/src/server/modules/folder/folder.router.ts

@@ -0,0 +1,17 @@
+import { readFolderOrTopLevelFolderSchema } from "~/schemas/folder";
+import { protectedProcedure, router } from '~/server/trpc'
+
+
+export const folderRouter = router({
+    readFolderOrTopLevelFolder: protectedProcedure.input(readFolderOrTopLevelFolderSchema).query(async ({ input, ctx }) => {     
+        // TODO: Fill these in later
+        const folderName: string = ""
+        const children: {id: string, name: string, type: 'page' | 'folder'}[] = []
+        // Not sure if a backpointer is needed here
+        const parentId: string = ""
+        return {
+            folderName, children, parentId
+        }
+    })
+
+})