feat(README): add security policy

SCKelemen · SCKelemen · commit 38a9abbb82f4 · 2024-09-23T16:05:25.000+02:00
diff --git a/README.md b/README.md
@@ -168,3 +168,11 @@ sg.SerialDeps(
 	GitVerifyNoDiff,
 )
 ```
+
+## Security
+
+Security is very important to us. If you discover a security issue, please
+report it via email to security@einride.tech
+
+For more information, please consult our
+[vulnerability disclosure policy](https://www.einride.tech/vulnerability-disclosure-policy).
