Add version lifecycle

Author: marijnvanwezel

LIFECYCLE.md

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+# Version lifecycle
+
+Since php-cypher-dsl version 5.0.0, support is governed by this version lifecycle.
+
+**Bugfix support** means that issues will be fixed for a version of php-cypher-dsl. Bugfix support for every major release `X` ends **six months** after the release of the next major version (`X+1`). Bugfix support for minor release `X.Y` will end with the release of the next minor version (`X.(Y+1)`).
+
+It is strongly recommended to use a version of php-cypher-dsl that has active bugfix support. Versions that are no longer receiving bugfix support will not receive any security or bug fixes. They may contain known critical vulnerabilities and other major bugs, including the threat of possible data loss and/or corruption.
+
+## Supported versions
+
+| Major version    | PHP version | Initial release  | End of bugfix support |
+|------------------|-------------|------------------|-----------------------|
+| php-cypher-dsl 5 | >=7.4    | To be determined | To be determined      |