feat: transaction framework

models/transaction.ts

@@ -0,0 +1,28 @@
+export interface Category {
+  id: string,
+  name: string,
+}
+
+export interface Tag {
+  id: string,
+  name: string,
+}
+
+export interface Amount{
+  currency: string,
+  val: string,
+}
+
+export interface Transaction{
+  id: string,
+  description: string,
+  time: string,
+  category?: Category,
+  tags?: Tag[],
+  amount?: 
+}
+
+export interface TransactionGroup {
+  group_title: string,
+  transactions?: Transaction[],
+}