add readme, assets, and data!

src/main/resources/data/templates/recipes/slope.json

@@ -0,0 +1,20 @@
+{
+  "type": "minecraft:crafting_shaped",
+  "pattern": [
+    "I  ",
+    "I~ ",
+    "III"
+  ],
+  "key": {
+    "I": {
+      "item": "minecraft:bamboo"
+    },
+    "~": {
+      "item": "minecraft:string"
+    }
+  },
+  "result": {
+    "item": "templates:slope",
+    "count": 4
+  }
+}