docs: add minimal skeleton for gitbook

.gitbook.yaml

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+root: docs
+structure:
+  readme: README.md
+  summary: docs/README.md

docs/README.md

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+# Table of Contents
+
+* [Read Me](../README.md)
+* Getting Started
+  * [Installation](introduction/installation.md)
+  * [Usage with Typescript](introduction/usage-with-typescript.md)
+  * [Usage with Javascript](introduction/usage-with-javascript.md)
+  * [Dependency Injection](introduction/usage-with-di.md)
+  * [Core Principes](introduction/core-principes.md)
+* [Basic Usage](basics/README.md)
+  * [Validating objects](basics/validating-objects.md)
+  * [Validating arrays](basics/validating-arrays.md)
+  * [Validating nested objects](basics/validating-nested-objects.md)
+* [Advanced Usage](advanced/README.md)
+  * [Conditional Validation](advanced/conditional-validation.md)
+  * [Validation Groups](advanced/validation-groups.md)
+  * [Inheritance](advanced/inheritance.md)
+  * [Custom Validation Decorators](advanced/validations-decoratos.md)
+  * [Custom Validation Classes](advanced/validation-classes.md)
+* [Decorators Reference](reference/decoratos.md)  
+  * [Common Decorators](reference/common-decoratos.md)  
+  * [Number Decorators](reference/number-decoratos.md)  
+  * [String Decorators](reference/string-decoratos.md)  
+  * [Date Decorators](reference/date-decoratos.md)  
+  * [Array Decorators](reference/array-decoratos.md)  
+* [Recipes](recipes/README.md)
+  * [Simple Validations](https://stackblitz.com/edit/class-transformer-simple-validations)
+  * [Nested Objects](https://stackblitz.com/edit/class-transformer-nested-objects)
+  * [Using Groups](https://stackblitz.com/edit/class-transformer-using-groups)
+  * [Custom Validators](https://stackblitz.com/edit/class-transformer-custom-validator)
+  * [Custom Decorators](https://stackblitz.com/edit/class-transformer-custom-decorators)
+  * [Using Schemas](https://stackblitz.com/edit/class-transformer-schemas)
+  * [Inheritance](https://stackblitz.com/edit/class-transformer-inheritance)
+* [API Reference](api/README.md)
+  * [validate](api/validate.md)
+  * [ValidatorOptions ](api/ValidatorOptions.md)
+  * [ValidationError ](api/ValidationError.md)
+* [Change Log](../CHANGELOG.md)

docs/basics/validating-objects.md

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+# Validating objects
+
+```ts
+import { validate, IsString, IsInt, IsDate, MaxLength, Min, Max} from "class-validator";
+
+export class Book {
+
+  @IsString()
+  @MaxLength(255)
+  title: string;
+
+  @IsString()
+  @MaxLength(255)
+  author: string;
+
+  @IsInt()
+  @Min(0)
+  @Max(10)
+  rating: number;
+
+  @IsDate()
+  publishDate: Date;
+
+}
+
+const book = new Book();
+post.title = 'Don Quixote';
+post.author = 'Miguel De Cervantes';
+post.rating = 11;
+post.publishDate = 1615;
+
+validate(book).then(errors => { 
+  // errors is an array of ValidationErrors
+  if (errors.length > 0) {
+    console.warn("validation failed. errors: ", errors);
+  }
+});
+```
+
+Run this example on [Stackblitz](https://stackblitz.com/edit/class-validator-simple-example)

docs/introduction/installation.md

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+# Installation
+
+To install the stable version:
+
+```
+npm install --save class-validator
+```
+
+### Usage in the browser
+
+If you want to use `class-validator` in the browser and you use Webpack then just import it into your project and Webpack will take care of the rest.
+
+### Next version
+
+You can install the next version of `class-validator` via
+
+```
+npm install --save class-validator@next
+```
+
+> Note: The next version can break anytime without notice. Do not use this in production.