Add Symfony Deprecation Contracts package

- Created CHANGELOG.md to maintain version history.
- Added README.md with usage instructions for the trigger_deprecation() function.
- Initialized composer.json for the Symfony Deprecation Contracts library, specifying dependencies and autoloading.

modules/pshowsso/deps/league/oauth2-google/CHANGELOG.md

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+OAuth 2.0 Google Provider Changelog
+
+## 4.0.1 - 2022-03-17
+
+### Changed
+
+- Corrected file excludes for dist archive, #120 by @cedric-anne
+
+## 4.0.0 - 2022-03-04
+
+### Changed
+
+- Adding return type, #98 by @yozhef
+- Add PHP 8.0 support, require PHP 7.3 or newer, #102 by @yozhef
+
+## 3.0.4 - 2021-01-27
+
+### Fixed
+
+- Correct OAuth endpoint, #94 by @Slamdunk
+
+## 3.0.3 - 2020-07-24
+
+### Fixed
+
+- Remove the `approval_prompt` from default parameters, #90
+
+## 3.0.2 - 2019-11-16
+
+### Fixed
+
+- Allow for `family_name` to be undefined in user information, #79 by @majkel89
+
+## 3.0.1 - 2018-12-28
+
+### Fixed
+
+- Correct conflict handling for prompt option, #69 by @mxdpeep
+
+## 3.0.0 - 2018-12-23
+
+### Changed
+
+- Update to latest version of Google OAuth
+- Use only OpenID Connect for user details
+
+### Fixed
+
+- Correct handling of selecting from multiple user accounts, #45
+- Prevent conflict when using prompt option, #42
+
+### Added
+
+- Add "locale" to user details, #60
+- Support additional scopes at construction
+
+### Removed
+
+- Dropped support for Google+ user details, #34 and #63
+
+## 2.2.0 - 2018-03-19
+
+### Added
+
+- Hosted domain validation, #54 by @pradtke
+
+## 2.1.0 - 2018-03-09
+
+### Added
+
+- OpenID Connect support, #48 by @pradtke
+
+## 2.0.0 - 2017-01-24
+
+### Added
+
+- PHP 7.1 support
+
+### Removed
+
+- Dropped PHP 5.5 support
+
+## 1.0.0 - 2015-08-12
+
+- Initial release