Add similarweb extension

extensions/similarweb/.gitignore

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+# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
+
+# dependencies
+/node_modules
+
+# Raycast specific files
+raycast-env.d.ts
+.raycast-swift-build
+.swiftpm
+compiled_raycast_swift
+compiled_raycast_rust
+
+# misc
+.DS_Store

extensions/similarweb/.prettierrc

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+{
+  "printWidth": 120,
+  "singleQuote": false
+}

extensions/similarweb/CHANGELOG.md

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+# Similarweb Changelog
+
+## [Initial Version] - {PR_MERGE_DATE}
+
+### Add Commands
+
+- Show Website Data: fetch analytics for any domain or the active browser tab
+- History: browse, copy, and manage locally stored website snapshots

extensions/similarweb/README.md

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+# Similarweb
+
+Fetch Similarweb analytics, which include rankings, traffic trends, and audience insights for any website, and explore the locally stored history of your lookups.
+
+## Features
+
+- **Show Website Data**: Fetch website analytics for any domain or the active browser tab
+- **History**: Browse and manage previously fetched website snapshots stored locally
+
+## Data Source
+
+This extension fetches data from Similarweb's public API endpoints. No API key is required.
+
+## Storage
+
+Website snapshots are stored locally in Raycast's LocalStorage for quick access and offline browsing.

extensions/similarweb/eslint.config.mjs

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+import { defineConfig } from "eslint/config";
+import raycastConfig from "@raycast/eslint-config";
+
+export default defineConfig([...raycastConfig]);