Setup basic portfolio interface

src/index.ts

@@ -1,4 +1,14 @@
 import { createLogger, transports, format } from "winston";
+import { Account } from "./interface/account";
+import { Quote } from "./interface/quote"
+
+export interface Exchange {
+    name: string;
+
+    fetchAccounts: () => Account[];
+    fetchQuote: (symbol: string) => Quote;
+}
+
 
 const logger = createLogger({
     transports: [new transports.Console()],
@@ -10,5 +20,5 @@ const logger = createLogger({
       })
     ),
   });
-  
-logger.info("Hello world!");
+
+logger.info("Hello world!");