adding dev bundle to SCM so that first run should be fast

Author: mstahv

.gitignore

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+target

src/main/dev-bundle/README.md

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+This directory is automatically generated by Vaadin and contains the pre-compiled 
+frontend files/resources for your project (frontend development bundle).
+
+It should be added to Version Control System and committed, so that other developers
+do not have to compile it again.
+
+Frontend development bundle is automatically updated when needed:
+- an npm/pnpm package is added with @NpmPackage or directly into package.json
+- CSS, JavaScript or TypeScript files are added with @CssImport, @JsModule or @JavaScript
+- Vaadin add-on with front-end customizations is added
+- Custom theme imports/assets added into 'theme.json' file
+- Exported web component is added.
+
+If your project development needs a hot deployment of the frontend changes, 
+you can switch Flow to use Vite development server (default in Vaadin 23.3 and earlier versions):
+- set `vaadin.frontend.hotdeploy=true` in `application.properties`
+- configure `vaadin-maven-plugin`:
+```
+   <configuration>
+       <frontendHotdeploy>true</frontendHotdeploy>
+   </configuration>
+```
+- configure `jetty-maven-plugin`:
+```
+   <configuration>
+       <systemProperties>
+           <vaadin.frontend.hotdeploy>true</vaadin.frontend.hotdeploy>
+       </systemProperties>
+   </configuration>
+```
+
+Read more [about Vaadin development mode](https://vaadin.com/docs/next/configuration/development-mode/#pre-compiled-front-end-bundle-for-faster-start-up).