Add natively_connectable example

**Describe the bug**
No natively_connectable example exists in this repository.

**To Reproduce**
Search for "natively_connectable" in this repository.

**Expected behavior**
A clear and concise description of "natively_connectable" usage and sample.

**Screenshots**

**Notes**

https://peter.sh/experiments/chromium-command-line-switches/

> --native-messaging-connect-extension ⊗ | Requests a native messaging connection be established between the extension with ID specified by this switch and the native messaging host named by the kNativeMessagingConnectHost switch. ↪
>
> --native-messaging-connect-host ⊗ | Requests a native messaging connection be established between the native messaging host named by this switch and the extension with ID specified by kNativeMessagingConnectExtension. ↪
>
> --native-messaging-connect-id ⊗ | If set when kNativeMessagingConnectHost and kNativeMessagingConnectExtension are specified, is reflected to the native messaging host as a command line parameter. ↪

Source: https://source.chromium.org/chromium/chromium/src/+/main:chrome/browser/extensions/api/messaging/native_messaging_launch_from_native.cc