docs: add shields into doc

README.md

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 # Google Tag Manager Apex Chat Tag Template
 
+[![Template Status](https://img.shields.io/badge/Community%20Template%20Gallery%20Status-published-green)](https://tagmanager.google.com/gallery/#/owners/justia/templates/gtm-apex-chat-tag-template) ![Repo Size](https://img.shields.io/github/repo-size/justia/gtm-apex-chat-tag-template) ![License](https://img.shields.io/github/license/justia/gtm-apex-chat-tag-template)
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 ## Summary
 This repository contains a [Google Tab Manager Tag template](https://developers.google.com/tag-manager/templates) that injects the [Apex Chat](https://www.apexchat.com/) into the page given the company key. Please check their [Terms of Service](https://www.apexchat.com/terms-of-service/) before using this tag.