fix expo module resolution by adding "main" file

Matthieu Gicquel · Matthieu Gicquel · commit a3addc57102d · 2023-12-04T12:16:37.000+01:00
see for instance rnmapbox/maps#2515
diff --git a/src/index.ts b/src/index.ts
@@ -0,0 +1 @@
+// No JS API for now, but without this file expo plugin resolution fails

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1 @@`
	`1`	`+// No JS API for now, but without this file expo plugin resolution fails`