Add Dynamic Poll Web Part with core functionality and styling

- Initialize Gulp build process with gulpfile.js
- Create package.json for project dependencies and scripts
- Add TypeScript declarations for SCSS modules
- Implement DynamicPollWebPart with property pane configuration
- Create PollDataService for SharePoint list interactions
- Develop core polling logic in PollCore.ts
- Define types for polls and answers in PollTypes.ts
- Create React components for DynamicPoll UI
- Add localization support for English and German
- Implement unit tests for core polling functionality
- Set up TypeScript and TSLint configurations

.gitignore

@@ -0,0 +1,19 @@
+node_modules/
+lib/
+dist/
+temp/
+release/
+solution/
+sharepoint/solution/
+*.sppkg
+*.tgz
+coverage/
+*.resx.ts
+*.scss.ts
+*.log
+npm-debug.log*
+.vs/
+.idea/
+.DS_Store
+Thumbs.db
+