📝 add readme

Author: silencesys

README.md

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+# PHP+OCI8 Docker image
+
+This is my custom docker image based on official php-fpm image with installed oci8 and few other extensions.
+
+## Available extensions
+- zip
+- gdo
+- opcache
+- pdo_mysql
+- tokenizer
+- bcmath
+- pcntl
+- oci8
+
+## How to use this image
+You can freely use this image as a base for your own docker images. Simply put to your Dockerfile following line:
+```Docker
+FROM silencesys/php-oci8:latest
+```
+
+To modify php configuration.
+```Docker
+COPY ./config/your_config.ini /usr/local/etc/php/conf.d/custom.ini
+COPY ./config/pool.d/your_pool.conf /usr/local/etc/php-fpm.d/costum.conf
+```
+
+You have also ability to modify default php settings as is described [there](https://docs.docker.com/samples/library/php/).