Create README.md

Author: matyhtf

README.md

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+# php-docker
+
+Only for development and CI environments, integrated compiler, header files, debugger tools.
+
+The size of the image is too large, do not use it in a production environment
+
+
+## generate Dockerfile
+```php
+./generator
+```
+
+> Do not modify the Dockerfile, which is automatically generated by `generator`. If you want to update, you need to modify the template file and generator code