Added applicationForm create from existing application

Author: ilyamerman

package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "@unit-finance/unit-node-sdk",
-  "version": "0.8.9",
+  "version": "0.8.10",
   "description": "",
   "main": "dist/unit.js",
   "types": "dist/unit.d.ts",

package.json

@@ -26,6 +26,17 @@ export interface CreateApplicationFormRequest {
          * Optional. Array of Individual, Business or SoleProprietorship. Restrict the available application type for this specific application.
          */
         allowedApplicationTypes?: Array<"Individual" | "SoleProprietorship" | "Business">
+    },
+    relationships?: {
+        /**
+         * See [Create an Application Form from an existing Application](https://developers.unit.co/application-forms/#create-an-application-form-from-an-existing-application)
+         */
+        application?: {
+            data: {
+                type: "application",
+                id: string
+            }
+        }
     }
 }