chore: initial extension structure

extension/.gitignore

@@ -0,0 +1,38 @@
+
+# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
+
+# dependencies
+/node_modules
+/.pnp
+.pnp.js
+
+# testing
+/coverage
+
+#cache
+.turbo
+
+# misc
+.DS_Store
+*.pem
+
+# debug
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+.pnpm-debug.log*
+
+# local env files
+.env*
+
+out/
+build/
+dist/
+
+.plasmo
+
+# bpp - http://bpp.browser.market/
+keys.json
+
+# typescript
+.tsbuildinfo