Add nestjs example

example/with-nestjs/README.md

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+Setup PostgreSQL server and run following commands.
+
+```
+$ npm install
+$ npm run migrate
+$ npm run generate
+$ npm run test
+```

example/with-nestjs/jest.config.ts

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+import type { Config } from "jest";
+
+const config: Config = {
+  moduleFileExtensions: ["js", "json", "ts"],
+  rootDir: ".",
+  testEnvironment: "node",
+  testRegex: ".test.ts$",
+  transform: {
+    "^.+\\.ts$": "ts-jest",
+  },
+  maxWorkers: 1,
+  globalSetup: "<rootDir>/test/global-setup.ts",
+  setupFilesAfterEnv: ["<rootDir>/test/setup.ts"],
+};
+
+export default config;