chore: add the readme.md file for the generator (#1245)

Co-authored-by: Lukasz Gornicki <lpgornicki@gmail.com>

apps/generator/README.md

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+Generator is a tool that you can use to generate whatever you want basing on the AsyncAPI specification file as an input. For more information [read the docs](https://www.asyncapi.com/docs/tools/generator).
+
+There is a large number of templates that are ready to use and are officially supported by the AsyncAPI Initiative.
+
+## List of official generator templates
+
+<!-- templates list is validated with GitHub Actions do not remove list markers -->
+<!-- TEMPLATES-LIST:START -->
+
+| Template Name                                 | Description                                                     | Source code                                                                 |
+| --------------------------------------------- | --------------------------------------------------------------- | --------------------------------------------------------------------------- |
+| `@asyncapi/nodejs-template`                   | Generates Nodejs service that uses Hermes package               | [click here](https://github.com/asyncapi/nodejs-template)                   |
+| `@asyncapi/nodejs-ws-template`                | Generates Nodejs service that supports WebSockets protocol only | [click here](https://github.com/asyncapi/nodejs-ws-template)                |
+| `@asyncapi/java-template`                     | Generates Java JMS application                                  | [click here](https://github.com/asyncapi/java-template)                     |
+| `@asyncapi/java-spring-template`              | Generates Java Spring service                                   | [click here](https://github.com/asyncapi/java-spring-template)              |
+| `@asyncapi/java-spring-cloud-stream-template` | Generates Java Spring Cloud Stream service                      | [click here](https://github.com/asyncapi/java-spring-cloud-stream-template) |
+| `@asyncapi/python-paho-template`              | Generates Python service that uses Paho library                 | [click here](https://github.com/asyncapi/python-paho-template)              |
+| `@asyncapi/html-template`                     | Generates HTML documentation site                               | [click here](https://github.com/asyncapi/html-template)                     |
+| `@asyncapi/markdown-template`                 | Generates documentation in Markdown file                        | [click here](https://github.com/asyncapi/markdown-template)                 |
+| `@asyncapi/ts-nats-template`                  | Generates TypeScript NATS client                                | [click here](https://github.com/asyncapi/ts-nats-template/)                 |
+| `@asyncapi/go-watermill-template`             | Generates Go client using Watermill                             | [click here](https://github.com/asyncapi/go-watermill-template)             |
+| `@asyncapi/dotnet-nats-template`              | Generates .NET C# client using NATS                             | [click here](https://github.com/asyncapi/dotnet-nats-template)              |
+| `@asyncapi/php-template`                      | Generates PHP client using RabbitMQ                             | [click here](https://github.com/asyncapi/php-template)                      |
+| `@asyncapi/dotnet-rabbitmq-template`          | Generates .NET C# client using RabbitMQ                         | [click here](https://github.com/asyncapi/dotnet-rabbitmq-template)          |
+
+<!-- TEMPLATES-LIST:END -->
+
+You can find above templates and the ones provided by the community in **[this list](https://github.com/search?q=topic%3Aasyncapi+topic%3Agenerator+topic%3Atemplate)**