Add Vue example for PSPDFKit integration

- Created a new Vue.js example project demonstrating the integration of PSPDFKit for Web.
- Added essential files including index.html, package.json, and README.md with setup instructions.
- Implemented components for PDF viewing and file upload functionality.
- Included scripts for verifying installation and copying necessary PSPDFKit files.
- Configured Vite for development and build processes.
- Added .gitignore to exclude node_modules and PSPDFKit library files.
- Included sample PDF and favicon assets for demonstration.

Author: ritz078

examples/vue/.gitignore

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+/node_modules
+public/js/pspdfkit.js
+public/js/pspdfkit-lib/*

examples/vue/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 © 2018-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/vue/README.md

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+# Nutrient Web SDK Example – Vue
+
+This example shows how to integrate [PSPDFKit for Web](https://www.nutrient.io/web/) into a Vue.js app.
+
+## Prerequisites
+
+- [Node.js](http://nodejs.org/)
+- PSPDFKit for Web (get your free trial [here](https://www.nutrient.io/try/))
+
+## 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-vue.git
+cd pspdfkit-web-example-vue
+```
+
+Install the project dependencies with `npm`:
+
+```bash
+npm install
+```
+
+## Vue Component
+
+The Vue component which implements the PSPDFKit for Web integration is included at `src/App.vue` with the rest of the example.
+
+In order to make the PSPDFKit for Web's library available for building, we have to copy the `pspdfkit-lib/` directory from `node_modules/pspdfkit/dist/` into the `public/js/` directory. This is done in the `package.json` script `verify-installation` which is executed by `serve`.
+
+## Running the Example
+
+We are ready to launch the app! 🎉
+
+```bash
+npm run serve
+```
+
+You can now open http://localhost:4173 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.

examples/vue/index.html

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+<!DOCTYPE html>
+<html lang="">
+  <head>
+    <meta charset="utf-8" />
+    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
+    <meta name="viewport" content="width=device-width,initial-scale=1.0" />
+    <link rel="icon" href="/favicon.ico" />
+    <title>Nutrient Web SDK Vue example</title>
+  </head>
+  <body>
+    <noscript>
+      <strong
+        >We're sorry but Nutrient Web SDK doesn't work properly without
+        JavaScript enabled. Please enable it to continue.</strong
+      >
+    </noscript>
+    <div id="app"></div>
+    <script src="/js/pspdfkit.js"></script>
+    <script type="module" src="/src/main.js"></script>
+  </body>
+</html>