Fixed some issues, and made things readible from File.

build.gradle

@@ -1,5 +1,6 @@
 plugins {
     id 'java'
+    id 'com.gradleup.shadow' version '9.0.0-beta7'
 }
 
 group = 'me.zacharias'
@@ -10,8 +11,16 @@ repositories {
 }
 
 dependencies {
+    implementation 'com.google.code.gson:gson:2.12.1'
+    implementation("org.jetbrains:annotations:23.1.0")
 }
 
 test {
     useJUnitPlatform()
+}
+
+jar{
+    manifest {
+        attributes 'Main-class': 'me.zacharias.bank.Main'
+    }
 }