refactor: add info about WIKIPEDIA environment to docker readme

docker/README.md

@@ -8,6 +8,7 @@
   - [Environment variables that can be set in the Docker container](#environment-variables-that-can-be-set-in-the-docker-container)
     - [OpenSearch](#opensearch)
     - [Search Config](#search-config)
+    - [Wikipedia](#wikipedia)
     - [Applications](#applications)
     - [Curl](#curl)
 - [Docker version issues](#docker-version-issues)
@@ -53,6 +54,7 @@ services:
       - TZ="America/New_York"
       - CONFIG_GOOGLE_DOMAIN="com"
       - CONFIG_GOOGLE_LANGUAGE="en"
+      - CONFIG_WIKIPEDIA_LANGUAGE="en"
     volumes:
       - ./nginx_logs:/var/log/nginx
       - ./php_logs:/var/log/php7
@@ -92,6 +94,14 @@ This docker image was developed with high configurability in mind, so here is th
 
 <br>
 
+### Wikipedia
+
+| Variables | Default | Examples | Description |
+|:----------|:-------------|:---------|:------|
+| CONFIG_WIKIPEDIA_LANGUAGE | "en" | "pt", "es", "hu" | Adds language support for Wikipedia results |
+
+<br>
+
 ### Applications
 
 | Variables | Default | Examples | Description |