Nextcloud. README.md added.

nextcloud/README.md

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+# Configuration
+
+## Serve HTTP from the container
+
+By default NextCloud internal Nginx config has redirects from internal 80 port
+to 443 (HTTPS).
+So if you want to reverse-proxy Nextcloud, you'll need to have a plain HTTP
+connection to the Nextcloud.
+
+Example of `/config/nginx/site-confs/default` changes:
+
+```
+#server {
+#    listen 80;
+#    listen [::]:80;
+#    server_name _;
+#    return 301 https://$host$request_uri;
+#}
+server {
+    #listen 443 ssl http2;
+    listen 80;
+    listen [::]:80;
+    #listen [::]:443 ssl http2;                                                                
+    server_name _;
+    #ssl_certificate /config/keys/cert.crt;
+    #ssl_certificate_key /config/keys/cert.key;
+```
+
+You'll have access to the Nextcloud Nginx config after first run of Nextcloud
+container. Don't forget to configure `/config` bind mount.