add theme selector

interface/src/components/ThemeSelector.tsx

@@ -0,0 +1,18 @@
+const downloadTheme = (themeName: string, themeURL: string) => {
+  // send message to the background script
+  chrome.runtime.sendMessage({
+    type: 'currentTab',
+    info: 'SetTheme',
+    body: {
+      themeName: themeName,
+      themeURL: themeURL
+    }
+  });
+}
+
+
+export default function ThemeSelector() {
+  return (
+  <button onClick={() => downloadTheme('Dark', 'https://raw.githubusercontent.com/SethBurkart123/BetterSEQTA-Themes/main/themes/test.json')}>Dark</button>
+  )
+}