Create squadcast-takeover.yaml

I tested the takeover creating an account, added a subdomain to point to the service and then linked another account with the subdomain.

http/takeovers/squadcast-takeover.yaml

@@ -0,0 +1,26 @@
+id: squadcast-takeover
+
+info:
+  name: squadcast takeover detection
+  author: philippedelteil
+  severity: medium
+  tags: takeover
+  reference: https://github.com/EdOverflow/can-i-take-over-xyz/issues/398
+
+requests:
+  - method: GET
+    path:
+      - "{{BaseURL}}"
+    redirects: true
+    max-redirects: 2
+    matchers-condition: and
+    matchers:
+      - type: word
+        words:
+          - 'There doesn’t seem to be an active status page associated with this URL.'
+          - 'Please check the URL and try again.'
+        condition: and
+      - type: status
+        status:
+          - 404
+