feat(selectedFontsStore): create selectedFontsStore to manage selected fonts collection

src/entities/Font/model/store/selectedFontsStore/selectedFontsStore.svelte.ts

@@ -0,0 +1,4 @@
+import { createEntityStore } from '$shared/lib';
+import type { UnifiedFont } from '../../types';
+
+export const selectedFontsStore = createEntityStore<UnifiedFont>([]);