add jam block

src/main/java/com/futhark/block/ModBlocks.java

@@ -0,0 +1,8 @@
+package com.futhark.block;
+import net.minecraft.block.Block;
+
+public class ModBlocks extends Block {
+    public ModBlocks(Settings settings) {
+		super(settings);
+    }
+}

src/main/java/com/futhark/item/ModItemGroups.java

@@ -0,0 +1,4 @@
+package com.futhark.item;
+
+public class ModItemGroups {
+}

src/main/resources/assets/futhark/models/item/jaffa_jam.json

@@ -0,0 +1,6 @@
+{
+  "parent": "item/generated",
+  "textures": {
+    "layer0": "futhark:item/jaffa_cake"
+  }
+}

src/main/resources/assets/futhark/models/item/jaffa_jam_block.json

@@ -0,0 +1,6 @@
+{
+  "parent": "block/cube_all",
+  "textures": {
+    "all":  "futhark:block/jaffa_jam_block"
+  }
+}