chore: add initial example for nestjs+jest

Author: omermorad

nestjs-jest/jest.config.js

@@ -1,14 +1,5 @@
 module.exports = {
-  preset: 'ts-jest',
   testEnvironment: 'node',
   testRegex: '.spec.ts$',
-  transform: {
-    '^.+\\.(ts|tsx)?$': [
-      'ts-jest',
-      {
-        isolatedModules: true,
-      },
-    ],
-  },
-  rootDir: '.',
+  transform: { '.ts': ['ts-jest', { isolatedModules: true } ] },
 };