Added README.md file.

Author: PavelBulat

README.md

@@ -0,0 +1,16 @@
+# Image for codeception with xDebug v3.
+
+## How to use xDebug?
+
+1. Configure you IDE to use xDebug with 9003 port.
+2. Configure PHP Web Page server in your IDE.
+3. Run docker container with env variabls for xDebug config.
+
+    ```yml
+      codecept:
+        environment:
+          PHP_IDE_CONFIG: serverName=my-ide
+          XDEBUG_MODE: develop,debug
+          XDEBUG_CONFIG: 'client_host=host.docker.internal start_with_request=yes idekey=my-ide'
+
+    ```