added js to discounts sample app

sample-apps/discounts/extensions/product-discount-js/.gitignore

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+dist
+generated

sample-apps/discounts/extensions/product-discount-js/input.graphql

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+query Input {
+  cart {
+    lines {
+      quantity
+      merchandise {
+        __typename
+        ...on ProductVariant {
+          id
+        }
+      }
+    }
+  }
+  discountNode {
+    metafield(namespace: "$app:volume-discount", key: "function-configuration") {
+      value
+    }
+  }
+}

sample-apps/discounts/extensions/product-discount-js/metadata.json

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+{"schemaVersions":{"product_discounts":{"major":1,"minor":0}}}

sample-apps/discounts/extensions/product-discount-js/package.json

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+{
+  "name": "product-discount",
+  "version": "0.0.1",
+  "license": "UNLICENSED",
+  "scripts": {
+    "shopify": "npm exec -- shopify",
+    "typegen": "npm exec -- shopify app function typegen",
+    "build": "npm exec -- shopify app function build",
+    "preview": "npm exec -- shopify app function run"
+  },
+  "codegen": {
+    "schema": "schema.graphql",
+    "documents": "input.graphql",
+    "generates": {
+      "./generated/api.ts": {
+        "plugins": [
+          "typescript",
+          "typescript-operations"
+        ]
+      }
+    }
+  }
+}