doc: comments for codebase and updated documentation

src/shared/lib/helpers/createEntityStore/createEntityStore.svelte.ts

@@ -75,6 +75,11 @@ export class EntityStore<T extends Entity> {
     }
 }
 
+/**
+ * Creates a new EntityStore instance with the given initial entities.
+ * @param initialEntities The initial entities to populate the store with.
+ * @returns - A new EntityStore instance.
+ */
 export function createEntityStore<T extends Entity>(initialEntities: T[] = []) {
     return new EntityStore<T>(initialEntities);
 }