add contribution guide to documentation (#2318)

* add contribution guide to doucmentation

* fix EOF

contrib/local-environment/docker-compose-keycloak.yaml

@@ -12,7 +12,6 @@
 # Access http://keycloak.localtest.me:9080 with the same credentials to check out the settings
 version: '3.0'
 services:
-
   oauth2-proxy:
     container_name: oauth2-proxy
     image: quay.io/oauth2-proxy/oauth2-proxy:v7.5.1
@@ -21,6 +20,8 @@ services:
     volumes:
       - "./oauth2-proxy-keycloak.cfg:/oauth2-proxy.cfg"
     restart: unless-stopped
+    ports:
+      - 4180:4180/tcp
     networks:
       keycloak: {}
       httpbin: {}
@@ -28,15 +29,17 @@ services:
     depends_on:
       - httpbin
       - keycloak
-    ports:
-      - 4180:4180/tcp
 
   httpbin:
     container_name: httpbin
     image: kennethreitz/httpbin:latest
     hostname: httpbin
+    ports:
+      - 8080:80/tcp
     networks:
-      httpbin: {}
+      httpbin:
+        aliases:
+          - httpbin.localtest.me
 
   keycloak:
     container_name: keycloak
@@ -50,19 +53,19 @@ services:
         '-Dkeycloak.migration.action=import',
         '-Dkeycloak.migration.provider=dir',
         '-Dkeycloak.migration.dir=/realm-config',
-        '-Dkeycloak.migration.strategy=IGNORE_EXISTING',
+        '-Dkeycloak.migration.strategy=IGNORE_EXISTING'
       ]
     volumes:
       - ./keycloak:/realm-config
     environment:
       KEYCLOAK_USER: admin@example.com
       KEYCLOAK_PASSWORD: password
+    ports:
+      - 9080:9080/tcp
     networks:
       keycloak:
         aliases:
           - keycloak.localtest.me
-    ports:
-      - 9080:9080/tcp
 
 networks:
   httpbin: {}