Blacked and isorted the python files

Prettied and eslinted the typescript/html files

bookie/src/app/sales/bills/kot.ts

@@ -0,0 +1,15 @@
+import { User } from '../../core/user';
+
+import { Inventory } from './inventory';
+
+export class Kot {
+  id: string;
+  code: number;
+  date: string;
+  user: User;
+  inventories: Inventory[];
+
+  public constructor(init?: Partial<Kot>) {
+    Object.assign(this, init);
+  }
+}