feat(package): add `description` to `package.json` and `README.md`

# feat(package): add `description` to `package.json` and `README.md`

| ⏱️ Estimate | 📊 Priority | 📏 Size | 📅 Start | 📅 End |
| --- | --- | --- | --- | --- |
| 1h | P2 | XS | 02-03-2026 | 02-03-2026 |

## 📸 Screenshots

| Current | Expected |
| :---: | :---: |
| N/A — This change has no visual impact. | N/A — This change has no visual impact. |

## 📝 Summary

- Add `description` field to `package.json` to document the project purpose
- Add `## Description` section to `README.md`

## 💡 Why this change?

- The `description` field is missing from `package.json`
- The `README.md` does not have a description section
- Tools like npm, bundlers and documentation generators use this field to describe the package

## ✅ Benefits

- The project description is available in `package.json` for npm registry and tooling
- The `README.md` documents the project purpose for developers
- Consistent with the GitHub repository description

## 📋 Steps

### Phase 1: Add description field to `package.json`
- [x] Add `description` field to `package.json`:

```diff
{
"name": "angular-setup",
"version": "0.0.0",
+ "description": "Base Angular setup project with ESLint, Prettier and TypeScript configuration",
"author": {
"name": "Beatriz Sopeña Merino",
...
},
...
}
```

### Phase 2: Add description section to `README.md`
- [x] Add `## Description` section to `README.md`:

```diff
# AngularSetup

This project was generated using [Angular CLI](https://github.com/angular/angular-cli) version 21.2.0.

+## Description
+
+Base Angular setup project with Prettier, ESLint and TypeScript configuration
+
## Development server
```

## 🧪 Tests

- [x] Verify `package.json` is valid:

```bash
npm install
```

## 🔗 References

### Files to modify
- `package.json`
- `README.md`

### Documentation
- https://docs.npmjs.com/cli/v10/configuring-npm/package-json#description