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

config/serve.json

@@ -0,0 +1,6 @@
+{
+  "$schema": "https://developer.microsoft.com/json-schemas/core-build/serve.schema.json",
+  "port": 4321, "https": true, "initialPage": "https://localhost:5432/workbench",
+  "api": { "port": 5432, "entryPath": "node_modules/@microsoft/sp-webpart-workbench/lib/api/" }
+}
+