Create Squid-7 release series page (#42)

TODO fill out the feature / change lists

Author: yadij

docs/Releases/Squid-7

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+# Squid 7
+
+|       |                               |
+| ----- | ----------------------------- |
+| JUl 2025 | Released for production use. |
+| | |
+
+The features have been set and large code changes are reserved for later
+versions.
+
+Additions are limited to:
+  - Security fixes
+  - Serious Bug fixes
+  - Documentation updates
+
+## Basic new features in 7.0:
+  - **Major UI changes:**
+  - **Minor UI changes:**
+  - **Developer Interest changes:**
+  - **Removed features**:
+
+Packages of Squid source code are available at <https://www.squid-cache.org/Versions/>
+
+## Security Advisories
+
+See our [Advisories](https://github.com/squid-cache/squid/security/advisories?state=published) list.
+
+## Open Bugs
+
+  - [Major or higher bugs currently affecting this
+    version](https://bugs.squid-cache.org/buglist.cgi?bug_id_type=anyexact&bug_severity=blocker&bug_severity=critical&bug_severity=major&bug_status=UNCONFIRMED&bug_status=NEW&bug_status=ASSIGNED&bug_status=REOPENED&chfieldto=Now&product=Squid&query_format=advanced&columnlist=bug_severity%2Cversion%2Cop_sys%2Cshort_desc&order=version%20DESC%2Cbug_severity%2Cbug_id&o2=equals&v2=unspecified&f1=version&o1=lessthaneq&v1=7).
+
+      - Bugs against any older version can be closed if found fixed in 7.x
+
+<!-- end list -->
+
+  - [Bugs new in this
+    version](http://bugs.squid-cache.org/buglist.cgi?query_format=advanced&product=Squid&version=7&bug_status=UNCONFIRMED&bug_status=NEW&bug_status=ASSIGNED&bug_status=REOPENED&bug_severity=blocker&bug_severity=critical&bug_severity=major&bug_severity=normal&bug_severity=minor&emailtype1=substring&email1=&emailtype2=substring&email2=&bugidtype=include&columnlist=bug_severity%2Cversion%2Cop_sys%2Cshort_desc&list_id=917&order=version%20DESC%2Cbug_severity%2Cbug_id)