Add a lang file in the MDG template so that a resources folder exists (#150)

Author: Matyrobbrt

src/main/resources/assets/examplemod/lang/en_us.json

@@ -0,0 +1,5 @@
+{
+  "itemGroup.examplemod": "Example Mod Tab",
+  "block.examplemod.example_block": "Example Block",
+  "item.examplemod.example_item": "Example Item"
+}