Add Offer to schemas

README.md

@@ -130,6 +130,7 @@ There are several preset schema components that can be used
 - Author
 - ItemReviewed
 - Location
+- Offer
 - Product
 - Question
 - Rating

src/core/schemas/Offer.js

@@ -0,0 +1,16 @@
+import JSONLDAbstractNode from '../JSONLDAbstractNode';
+
+class Offer extends JSONLDAbstractNode {
+  getJSON(isFirstChildNode = false, schema) {
+    const parseChildren = super.parseChildren();
+    const details = {
+      '@type': 'Offer',
+      ...schema
+    }
+    return isFirstChildNode
+      ? Object.assign(details, ...parseChildren)
+      : Object.assign({offer: details}, ...parseChildren);
+  }
+}
+
+export default Offer;

src/core/schemas/index.js

@@ -11,3 +11,4 @@ export { default as ItemReviewed } from './ItemReviewed';
 export { default as Question } from './Question';
 export { default as Answer } from './Answer';
 export { default as Graph } from './Graph';
+export { default as Offer } from './Offer';