Add Svelte example for PSPDFKit integration

- Created a new Svelte example project demonstrating the integration of PSPDFKit for Web.
- Added essential files including package.json, README.md, and rollup.config.js for build configuration.
- Implemented a basic HTML structure with a PDF viewer using PSPDFKit.
- Included scripts for verifying installation and copying necessary PSPDFKit files.
- Configured development and production build processes using Rollup.
- Added sample assets including a PDF document and favicon for demonstration.
- Implemented file upload functionality to open PDF documents dynamically.

Author: ritz078

examples/svelte/.gitignore

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+/node_modules/
+/public/build/
+/public/pspdfkit.js
+.DS_Store
+/public/pspdfkit-lib

examples/svelte/LICENSE

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+The PSPDFKit Sample applications are licensed with a modified BSD
+license. In plain language: you're allowed to do whatever you wish
+with the code, modify, redistribute, embed in your products (free or
+commercial), but you must include copyright, terms of usage and
+disclaimer as stated in the license.
+
+You will require a commercial PSPDFKit License to run these examples
+in non-demo mode. Please refer to [email protected] for details.
+
+Copyright © 2019-present PSPDFKit GmbH.
+All rights reserved.
+
+Redistribution and use in source or binary forms,
+with or without modification, are permitted provided
+that the following conditions are met:
+
+- Redistributions of source code must retain the above copyright
+  notice, this list of conditions and the following disclaimer.
+
+- Redistributions in binary form must reproduce the above copyright
+  notice, this list of conditions and the following disclaimer in the
+  documentation and/or other materials provided with the
+  distribution.
+
+- Redistributions of PSPDFKit Samples must include attribution to
+  PSPDFKit, either in documentation or other appropriate media.
+
+- Neither the name of the PSPDFKit, PSPDFKit GmbH, nor its developers
+  may be used to endorse or promote products derived from
+  this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

examples/svelte/README.md

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+# Nutrient Web SDK Example - Svelte
+
+This example shows how to integrate [Nutrient Web SDK](https://www.nutrient.io/web/) into a [Svelte](https://svelte.dev) app.
+
+## Prerequisites
+
+- [Node.js](http://nodejs.org/)
+
+## Support, Issues and License Questions
+
+PSPDFKit offers support for customers with an active SDK license via https://www.nutrient.io/support/request/
+
+Are you [evaluating our SDK](https://www.nutrient.io/try/)? That's great, we're happy to help out! To make sure this is fast, please use a work email and have someone from your company fill out our sales form: https://www.nutrient.io/sales/
+
+## Getting Started
+
+Clone the repo:
+
+```bash
+git clone https://github.com/PSPDFKit/pspdfkit-web-example-svelte.git
+cd pspdfkit-web-example-svelte
+```
+
+Install the project dependencies with `npm`:
+
+```bash
+npm install
+```
+
+In order to make the Nutrient Web SDK's library available for building, we have to copy the `pspdfkit-lib/` directory from `node_modules/pspdfkit/dist/` into the `public/` directory. This is done in the `package.json` script `verify-installation` which is executed by `dev` script.
+
+## Running the Example
+
+We are ready to launch the app! 🎉
+
+```bash
+npm run dev
+```
+
+You can now open http://localhost:3000/ in your browser and enjoy!
+
+## License
+
+This software is licensed under a [modified BSD license](LICENSE).
+
+## Contributing
+
+Please ensure
+[you have signed our CLA](https://www.nutrient.io/guides/web/current/miscellaneous/contributing/) so that we can
+accept your contributions.