chore: add app config with GQL URL and PORT 3001

packages/web/.env-example

@@ -0,0 +1,2 @@
+PORT=3001
+REACT_APP_GRAPHQL_URL=http://localhost:3000/graphql

packages/web/src/config/app.ts

@@ -0,0 +1,9 @@
+type Config = {
+  [key: string]: string,
+};
+
+const config: Config = {
+  graphqlUrl: process.env.REACT_APP_GRAPHQL_URL as string,
+};
+
+export default config;

packages/web/src/graphql/client.ts

@@ -1,6 +1,10 @@
 import { ApolloClient, InMemoryCache } from '@apollo/client';
+import appConfig from 'config/app';
 
 const cache = new InMemoryCache();
-const client = new ApolloClient({ cache: cache });
+const client = new ApolloClient({
+  uri: appConfig.graphqlUrl,
+  cache
+});
 
 export default client;