Merge pull request responsible-ai-collaborative#2479 from responsible…

…-ai-collaborative/slack-badge

Add Slack badge to README

README.md

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 # Artificial Intelligence Incident Database (AIID)
 
 [![Netlify Status](https://api.netlify.com/api/v1/badges/9eb0dda2-916c-46f9-a0bd-9ddab3879c6e/deploy-status)](https://app.netlify.com/sites/aiid/deploys)
+[![Slack Link](https://img.shields.io/badge/Join%20the%20RAIC%20Slack!-purple?logo=slack)](https://forms.gle/v7UHJvEkYSJQ7jHj7)
 
 Information about the goals and organization of the AI Incident Database can be found on the [production website](https://incidentdatabase.ai/). This page concentrates on onboarding for the following types of contributions to the database,