feat(nestjs) Adding NestJS plugin (#13104)

* Adding NestJS command aliases
* Removed installation instructions from the README file of NestJS plugin

plugins/nestjs/README.md

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+# NestJS Plugin for Oh My Zsh
+
+This plugin provides aliases for common [NestJS CLI](https://docs.nestjs.com/cli/overview) commands.
+
+## Requirements
+
+- [NestJS CLI](https://docs.nestjs.com/cli/overview#installation) installed globally:
+  `npm install -g @nestjs/cli`
+
+## Aliases
+
+| Alias   | Command                      | Description                                 |
+| :------ | :--------------------------- | :------------------------------------------ |
+| `nnew`  | `nest new`                   | Create a new NestJS project                 |
+| `nb`    | `nest build`                 | Build the NestJS application                |
+| `ns`    | `nest start`                 | Start the application                       |
+| `nsw`   | `nest start --watch`         | Start the application in watch mode         |
+| `nsd`   | `nest start --dev`           | Start the application in dev mode           |
+| `nsdbg` | `nest start --debug --watch` | Start the application in debug & watch mode |
+| `ng`    | `nest generate`              | Generate a NestJS element                   |
+| `ngm`   | `nest generate module`       | Generate a module                           |
+| `ngc`   | `nest generate controller`   | Generate a controller                       |
+| `ngs`   | `nest generate service`      | Generate a service                          |
+| `ngg`   | `nest generate guard`        | Generate a guard                            |
+| `ngp`   | `nest generate pipe`         | Generate a pipe                             |
+| `ngf`   | `nest generate filter`       | Generate a filter                           |
+| `ngr`   | `nest generate resolver`     | Generate a GraphQL resolver                 |
+| `ngcl`  | `nest generate class`        | Generate a class                            |
+| `ngi`   | `nest generate interface`    | Generate an interface                       |
+| `ngit`  | `nest generate interceptor`  | Generate an interceptor                     |
+| `ngmi`  | `nest generate middleware`   | Generate a middleware                       |
+| `ngd`   | `nest generate decorator`    | Generate a custom decorator                 |
+| `ngres` | `nest generate resource`     | Generate a CRUD resource                    |
+| `nglib` | `nest generate library`      | Generate a new library                      |
+| `ngsub` | `nest generate sub-app`      | Generate a new sub-application (monorepo)   |
+| `na`    | `nest add`                   | Add a library to the project                |
+| `ni`    | `nest info`                  | Display NestJS project information          |
+| `nu`    | `nest update`                | Update NestJS dependencies                  |
+
+## Usage
+
+1. Add `nestjs` to the `plugins` array in your `~/.zshrc` file:
+
+```zsh
+plugins=(... nestjs)
+```
+
+2. Restart your terminal or source your `~/.zshrc` file:
+
+```zsh
+source ~/.zshrc
+```

plugins/nestjs/nestjs.plugin.zsh

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+# Oh My Zsh plugin for NestJS CLI
+
+# Check if nest command exists
+if ! command -v nest &>/dev/null; then
+  return
+fi
+
+# Project creation
+alias nnew='nest new'
+
+# Basic development
+alias nb='nest build'
+alias ns='nest start'
+alias nsw='nest start --watch'
+alias nsd='nest start --dev' # Alias for start --watch
+alias nsdbg='nest start --debug --watch'
+
+# Code generation (short aliases)
+alias ng='nest generate'
+alias ngm='nest generate module'
+alias ngc='nest generate controller'
+alias ngs='nest generate service'
+alias ngg='nest generate guard'
+alias ngp='nest generate pipe'
+alias ngf='nest generate filter'
+alias ngr='nest generate resolver'
+alias ngcl='nest generate class'
+alias ngi='nest generate interface'
+alias ngit='nest generate interceptor'
+alias ngmi='nest generate middleware'
+alias ngd='nest generate decorator'
+alias ngres='nest generate resource'
+alias nglib='nest generate library'
+alias ngsub='nest generate sub-app'
+
+# Other commands
+alias na='nest add'
+alias ni='nest info'
+alias nu='nest update'
+
+# You can add more aliases or functions here as needed.