creating first structure of cinema backend server

Signed-off-by: Peter Siegmund <developer@mars3142.org>

server/cinema/lib/injectable.dart

@@ -0,0 +1,9 @@
+import 'package:get_it/get_it.dart';
+import 'package:injectable/injectable.dart';
+
+import 'injectable.config.dart';
+
+final getIt = GetIt.instance;
+
+@InjectableInit()
+void configureDependencies() => getIt.init();