Added sashimi item, and tuna->sashimi->nigiri recipes

src/main/resources/data/sushi/recipes/crafting_recipe_nigiri_tuna.json

@@ -0,0 +1,20 @@
+{
+    "type": "minecraft:crafting_shaped",
+    "pattern": [
+        "#",
+        "C"
+    ],
+    "key": {
+        "#": {
+            "item": "sushi:sashimi_tuna"
+        },
+        "C": {
+            "item": "farmersdelight:cooked_rice"
+        }
+    },
+    "result": {
+        "item": "sushi:nigiri_tuna",
+        "count": 1
+    },
+    "group": "food_nigiri"
+}

src/main/resources/data/sushi/recipes/cutting/sashimi_tuna.json

@@ -0,0 +1,17 @@
+{
+  "type": "farmersdelight:cutting",
+  "ingredients": [
+    {
+      "item": "sushi:fish_tuna"
+    }
+  ],
+  "result": [
+    {
+      "item": "sushi:sashimi_tuna",
+      "count": 5
+    }
+  ],
+  "tool": {
+    "tag": "c:tools/knives"
+  }
+}