chore: add clipper extension package (#2281)

packages/clipper/README.md

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+# @standardnotes/clipper
+
+## Development flow
+
+- Run `yarn watch:web` in a terminal to watch changes in the `@standardnotes/web` package
+
+### Chromium
+
+- Run `yarn watch-mv3` in another terminal to watch changes in the extension source
+
+#### "Load unpacked" method
+
+- Go to `chrome://extensions`
+- Enable `Developer mode`
+- Click "Load unpacked" and select the `dist` folder in the current package
+
+You might need to manually press the reload button when you make changers
+
+#### CLI method
+
+```console
+yarn run-chromium --chromium-profile=PATH/TO/PROFILE
+```
+
+- You might need to specify the Chromium binary using the `--chromium-binary` argument
+- Running `yarn run-chromium` without the `--chromium-profile` argument will create a new temporary profile every time
+
+This method will automatically reload the extension when you make changes
+
+### Firefox
+
+- Run `yarn watch` in another terminal to watch changes in the extension source
+
+```console
+yarn run-firefox --firefox-profile=PATH/TO/PROFILE
+```
+
+- You might need to specify the Firefox binary using the `--firefox` or `-f` argument
+- Running `yarn run-firefox` without the `--firefox-profile` argument will create a new temporary profile every time
+
+## Build
+
+## Firefox
+
+```console
+yarn build-firefox
+```
+
+## Chromium
+
+```console
+yarn build-chromium
+```