Add: Readme && Environment file

.env.example

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+PHP_USER_GROUP=1001:1000

README.md

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+# PHP-FPM
+
+Version: 7.4
+
+Copy .env.example to .env
+
+```
+cp .env.example .env
+```
+
+Modify variables:
+
+* PHP_USER_GROUP : Specify user and group PHP
+
+Build: 
+
+```
+docker-compose build
+```
+