add readme

Author: dictcp

.github/README.md

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+# docker/php alike Docker image with security backports for PHP 7.x
+
+TBC
+
+## Other backports attempt for EOL-ed PHP
+
+OSS
+- https://github.com/remicollet/php-src-security
+- https://github.com/shivammathur/php-src-backports
+
+Commenical
+- https://www.zend.com/services/php-long-term-support
+- https://www.cloudlinux.com/features/#hardened-php
+- https://www.freexian.com/lts/php/