add run test status badge

README.md

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 This Cloudflare Worker is designed to handle incoming SMS messages from Twilio webhooks and store them in Cloudflare KV (Key-Value) storage. It also provides functionality to retrieve stored messages for a given destination number.
 
+[![Run CI tests with Vitest](https://github.com/sctg-development/turgeand-messaging/actions/workflows/vitest.yml/badge.svg)](https://github.com/sctg-development/turgeand-messaging/actions/workflows/vitest.yml)
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 ## Features
 
 - Receives and stores incoming SMS data from Twilio webhooks