add rudimentary nextcloud docs with drop-off link sharing instructions

docs/nextcloud.md

@@ -1,6 +1,26 @@
 #Nextcloud
+## Installation
+We're assuming an Arch Linux installation, but the steps should be similar for other distributions.
+There are two possible ways to serve Nextclouds PHP code: uWSGI and PHP-FPM.
+We'll be using PHP-FPM as this is the recommended way and nginx is easier to setup with it, especially if you wish to enable additional plugins such as LDAP.
+
+TODO
+
 ## Setup a drop-off folder in Nextcloud
 
+1. Create a folder in Nextcloud, e.g. `Drop-off`.
+2. Click on the share icon and under share link select "File-drop". This will create a link that you can share with others.
+3. Optional: If you want to password protect the link, click on "Advanced settings" under the Sharing tab for the folder detailsand use a password of your choice.
+
+### Human-readable link with redirect
+If you want a nice human-readable link you can use your own nginx for this.
+Add to your existant server block with port 443 in `/etc/nginx/sites-available/nextcloud` or your domain of choice with the following content:
+
+```nginx
+location /dropoff {
+	return 301 <your nextcloud share link>;
+}
+```
 
 ## Sync contacts with khard
 TODO