Create release notes for the 2.25.x series.

docs/notes/2.25.x.md

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+# 2.25.x Release Series
+
+Pants is a fast, scalable, user-friendly build system for codebases of all sizes.
+
+Pants is an open-source project that is not owned or controlled by any one company or organization,
+and does incur some expenses. These expenses are managed by Pants Build, a non-profit that was
+established for this purpose. This non-profit's only source of revenue is
+[sponsorship](https://www.pantsbuild.org/sponsorship) by individuals and companies that use Pants.
+
+## What's New
+
+### Highlights
+
+### Deprecations
+
+### General
+
+### Goals
+
+### Backends
+
+### Plugin API changes
+
+## Full Changelog
+
+For the full changelog, see the individual GitHub Releases for this series: <https://github.com/pantsbuild/pants/releases>