add example

Author: Bielik20

apps/di/src/dep.ts

@@ -0,0 +1,8 @@
+import { Injectable } from '@wikia/dependency-injection';
+
+@Injectable()
+export class DepClass {
+  foo() {
+    return 'foo';
+  }
+}

apps/di/src/main.ts

@@ -1 +1,7 @@
-console.log('Hello World!');
+import { Injectable } from '@wikia/dependency-injection';
+import { DepClass } from './dep';
+
+@Injectable()
+export class MainClass {
+  constructor(public dep: DepClass) {}
+}