Add JSDoc for firestore adapter

server/src/data-layer/adapters/Firestore.ts

@@ -5,6 +5,9 @@ const converter = <T>() => ({
   fromFirestore: (doc: any) => doc.data() as T
 })
 
+/**
+ * Firestore adapter for the application.
+ */
 const firestore = Object.assign(
   () => {
     return admin.firestore()
@@ -13,9 +16,21 @@ const firestore = Object.assign(
     doc: <T>(path: string) => {
       return admin.firestore().doc(path).withConverter<T>(converter<T>())
     },
+    /**
+     * Collection adapter for Firestore.
+     * @param path The path to the collection.
+     * @returns The collection adapter.
+     */
     collection: <T>(path: string) => {
       return admin.firestore().collection(path).withConverter<T>(converter<T>())
     },
+    /**
+     * Subcollection adapter for Firestore.
+     * @param path The path to the main collection.
+     * @param docId The document ID from the main collection to retrieve.
+     * @param subpath The path to the subcollection.
+     * @returns The subcollection adapter.
+     */
     subcollection: <T>(path: string, docId: string, subpath: string) => {
       return admin
         .firestore()