create-svelte: allow importing JSON modules (#792)

Co-authored-by: Rich Harris <[email protected]>

Author: GrygrFlzr

Diff for: .changeset/poor-bobcats-unite.md

@@ -0,0 +1,5 @@
+---
+'create-svelte': patch
+---
+
+allow importing JSON modules

Diff for: packages/create-svelte/template-additions/tsconfig.json

@@ -8,6 +8,7 @@
 			*/
 		"importsNotUsedAsValues": "error",
 		"isolatedModules": true,
+		"resolveJsonModule": true,
 		/**
 			To have warnings/errors of the Svelte compiler at the correct position,
 			enable source maps by default.