JS order discounts examples (#172)

* Initial JavaScript implementation of order-discounts default Function.

* Add order-discounts/fixed-amount example.

* Adding shipping-discounts default

* Adding shipping discount fixed-amount example

* Adding product-discounts fixed-amount example

Author: ErinRenNumber1

discounts/javascript/order-discounts/default/.gitignore

@@ -0,0 +1,2 @@
+dist
+generated

discounts/javascript/order-discounts/default/input.graphql.liquid

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+query Input {
+  discountNode {
+    metafield(namespace: "$app:{{name | replace: " ", "-" | downcase}}", key: "function-configuration") {
+      value
+    }
+  }
+}

discounts/javascript/order-discounts/default/package.json.liquid

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+{
+  "name": "{{name}}",
+  "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"
+        ]
+      }
+    }
+  }
+}