Merge pull request #106 from rjsf-team/master

feat: Add Bootstrap 4 Theme support (rjsf-team#1938)

packages/bootstrap-4/.gitignore

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+.rts2_**

packages/bootstrap-4/README.md

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+<!-- PROJECT LOGO -->
+<br />
+<p align="center">
+  <a href="https://github.com/rjsf-team/react-jsonschema-form">
+    <img src="./react-bootstrap-4-logo.png" alt="Logo" width="140" height="120">
+  </a>
+
+  <h3 align="center">@rjsf/bootstrap-4</h3>
+
+  <p align="center">
+  Bootstrap-4 theme, fields and widgets for <a href="https://github.com/mozilla-services/react-jsonschema-form/"><code>react-jsonschema-form</code></a>.
+    <br />
+    <a href="https://react-jsonschema-form.readthedocs.io/en/latest/"><strong>Explore the docs »</strong></a>
+    <br />
+    <br />
+   <a href="https://rjsf-team.github.io/react-jsonschema-form/">View Playground</a>
+    ·
+    <a href="https://github.com/rjsf-team/react-jsonschema-form/issues">Report Bug</a>
+    ·
+    <a href="https://github.com/rjsf-team/react-jsonschema-form/issues">Request Feature</a>
+  </p>
+</p>
+
+<!-- TABLE OF CONTENTS -->
+
+## Table of Contents
+
+- [About The Project](#about-the-project)
+- [Getting Started](#getting-started)
+  - [Prerequisites](#prerequisites)
+  - [Installation](#installation)
+- [Usage](#usage)
+- [Contributing](#contributing)
+- [Contact](#contact)
+
+<!-- ABOUT THE PROJECT -->
+
+## About The Project
+
+
+Exports `bootstrap-4` theme, fields and widgets for `react-jsonschema-form`.
+
+### Built With
+
+- [react-jsonschema-form](https://github.com/mozilla-services/react-jsonschema-form/)
+- [Bootstrap-4](https://getbootstrap.com/docs/4.0/)
+- [Typescript](https://www.typescriptlang.org/)
+
+<!-- GETTING STARTED -->
+
+## Getting Started
+
+### Prerequisites
+
+- `react-bootstrap >= 1.0.1`
+- `@rjsf/core >= 2.2.0`
+
+```bash
+yarn add react-bootstrap @rjsf/core
+```
+
+### Installation
+
+```bash
+yarn add @rjsf/bootstrap-4
+```
+
+## Usage
+
+```js
+import Form from '@rjsf/bootstrap-4';
+```
+
+or
+
+```js
+import { withTheme } from '@rjsf/core';
+import { Theme as Bootstrap4Theme } from '@rjsf/bootstrap-4';
+
+const Form = withTheme(Bootstrap4Theme);
+```
+
+<!-- CONTRIBUTING -->
+
+## Contributing
+
+Read our [contributors' guide](https://react-jsonschema-form.readthedocs.io/en/latest/contributing/) to get started.
+
+<!-- CONTACT -->
+
+## Contact
+
+rjsf team: [https://github.com/orgs/rjsf-team/people](https://github.com/orgs/rjsf-team/people)
+
+GitHub repository: [https://github.com/rjsf-team/react-jsonschema-form](https://github.com/rjsf-team/react-jsonschema-form)
+
+<!-- MARKDOWN LINKS & IMAGES -->
+<!-- https://www.markdownguide.org/basic-syntax/#reference-style-links -->
+
+[build-shield]: https://github.com/rjsf-team/react-jsonschema-form/workflows/CI/badge.svg
+[build-url]: https://github.com/rjsf-team/react-jsonschema-form/actions
+[contributors-shield]: https://img.shields.io/github/contributors/rjsf-team/react-jsonschema-form.svg
+[contributors-url]: https://github.com/rjsf-team/react-jsonschema-form/graphs/contributors
+[license-shield]: https://img.shields.io/badge/license-Apache%202.0-blue.svg?style=flat-square
+[license-url]: https://choosealicense.com/licenses/apache-2.0/
+[npm-shield]: https://img.shields.io/npm/v/@rjsf/bootstrap-4/latest.svg?style=flat-square
+[npm-url]: https://www.npmjs.com/package/@rjsf/bootstrap-4
+[npm-dl-shield]: https://img.shields.io/npm/dm/@rjsf/bootstrap-4.svg?style=flat-square
+[npm-dl-url]: https://www.npmjs.com/package/@rjsf/bootstrap-4
+[product-screenshot]: https://raw.githubusercontent.com/rjsf-team/react-jsonschema-form/59a8206e148474bea854bbb004f624143fbcbac8/packages/bootstrap-4/screenshot.png