Add Linear integrations documentation

Co-authored-by: kevin <kevin@macherjek.at>

Author: cursoragent

readme2.md

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+# Connect your tools (3)
+
+Integrations turn Linear into your source of truth around product development. Keep data in sync, and eliminate manual updates between tools.
+
+![connect-your-tools.png](https://uploads.linear.app/fe63b3e2-bf87-46c0-8784-cd7d639287c8/c2eae035-37e2-4754-adcb-b8305431aa1f/c92d70c7-e6d0-4fa2-a0fd-78f6e780993a)
+
+### **Key integrations**
+
+* [**Slack**](https://linear.app/settings/integrations/slack)
+  Create issues from Slack messages and sync threads
+* [**GitHub**](https://linear.app/settings/integrations/github)** / **[**GitLab**](https://linear.app/settings/integrations/gitlab)
+  Automate your pull request, commit workflows, and keep issues synced both ways
+* [**Agents**](https://linear.app/integrations/agents)
+  Deploy AI agents that work alongside you as teammates
+
+### **Browse all integrations**
+
+Discover 150+ available connections in our [integration directory](https://linear.app/integrations) ? from bug creation via support tools (Intercom, Zendesk), to issues created from design explorations (Figma).
+
+### **Linear API**
+
+If you need something more custom, you can build directly on the Linear API (built on GraphQL). [See our Dev Docs to learn more](https://linear.app/developers).