Add NestJS Example

examples/9-nestjs/README.md

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+# NestJS Example
+
+This example demonstrates how to use `express-openapi-validator` with [NestJS](https://nestjs.com/).
+
+## Install
+
+From this `9-nestjs` directory, run:
+
+```shell
+npm ci
+```
+
+## Run
+
+### Start Server
+
+#### Watch Mode
+
+```shell
+npm run start
+```
+
+or
+
+```shell
+npm run start:dev
+```
+
+#### Production Mode
+
+```shell
+npm run build
+npm run start:prod
+```
+
+### Requests
+
+```shell
+curl --request GET --url http://localhost:3000/ping/foo
+```
+
+```shell
+curl --request POST \
+  --url http://localhost:3000/ping \
+  --header 'Content-Type: application/json' \
+  --data '{"ping": "GNU Terry Pratchett"}'
+```
+
+## Tests
+
+```shell
+npm run test
+```

examples/9-nestjs/jest.config.ts

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+import type { Config } from '@jest/types';
+
+const config: Config.InitialOptions = {
+  moduleFileExtensions: ['ts', 'js'],
+  testMatch: ['**/*.spec.ts'],
+  transform: {
+    '\\.ts': 'ts-jest',
+  },
+
+  testEnvironment: 'node',
+};
+export default config;

examples/9-nestjs/nest-cli.json

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+{
+  "sourceRoot": "src",
+  "compilerOptions": {
+    "deleteOutDir": false,
+    "tsConfigPath": "tsconfig.json"
+  }
+}