Add example nginx config of bbb server

nginx-config-bbb

+location /sr/ {
+     proxy_pass         http://127.0.0.1:8080/;
+     proxy_http_version 1.1;
+     proxy_set_header Upgrade $http_upgrade;
+     proxy_set_header Connection "Upgrade";
+     proxy_set_header Host $host;
+     proxy_buffering off;
+
+  }
+
+  location /msg_broker/ {
+     proxy_pass         http://127.0.0.1:3022/;
+     proxy_http_version 1.1;
+     proxy_set_header Upgrade $http_upgrade;
+     proxy_set_header Connection "Upgrade";
+     proxy_set_header Host $host;
+  }
+
+  location /relevant-terms/ {
+     proxy_pass         http://127.0.0.1:6060/;
+     proxy_http_version 1.1;
+     proxy_set_header Upgrade $http_upgrade;
+     proxy_set_header Connection "Upgrade";
+     proxy_set_header Host $host;
+  }