[trivial] add wiring for dependecy injection

src/main/java/com/example/flagsmithspringbootbankingapp/AppConfig.java

@@ -0,0 +1,21 @@
+package com.example.flagsmithspringbootbankingapp;
+
+import com.flagsmith.FlagsmithClient;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+public class AppConfig {
+    @Bean
+    public AccountService accountService() {
+        return new AccountService();
+    }
+
+    @Bean
+    public FlagsmithClient flagsmithClient() {
+        return FlagsmithClient
+                .newBuilder()
+                .setApiKey("ser.9ZHAnRhWWxs3xschtnbp6Z")
+                .build();
+    }
+}

src/main/java/com/example/flagsmithspringbootbankingapp/FlagsmithSpringBootBankingAppApplication.java

@@ -5,6 +5,7 @@
 import com.flagsmith.exceptions.FlagsmithApiError;
 import com.flagsmith.exceptions.FlagsmithClientError;
 import com.flagsmith.models.Flags;
+import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.beans.factory.annotation.Value;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
@@ -18,15 +19,15 @@
 @RestController
 @Service
 public class FlagsmithSpringBootBankingAppApplication {
-    private static AccountService accountService;
-    private static FlagsmithClient flagsmithClient;
+    @Autowired
+    private AccountService accountService;
+
+    @Autowired
+    private FlagsmithClient flagsmithClient;
+
+
     public static void main(String[] args) {
-        flagsmithClient = FlagsmithClient
-                .newBuilder()
-                .setApiKey("ser.****")
-                .build();
-    accountService = new AccountService();
-    SpringApplication.run(FlagsmithSpringBootBankingAppApplication.class, args);
+        SpringApplication.run(FlagsmithSpringBootBankingAppApplication.class, args);
     }
 
     // endpoint to create a new account