copy common ts code over from browser repo

src/models/response/keysResponse.ts

@@ -0,0 +1,12 @@
+class KeysResponse {
+    privateKey: string;
+    publicKey: string;
+
+    constructor(response: any) {
+        this.privateKey = response.PrivateKey;
+        this.publicKey = response.PublicKey;
+    }
+}
+
+export { KeysResponse };
+(window as any).KeysResponse = KeysResponse;