Added Gemini link and a Debian "how to"

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+# Deploying SpaceBeans on Debian
+
+This is simple "how to" to deploy the service on a stock Debian installation.
+
+All commands need to be run as `root` user.
+
+(tip: `sudo -i` if you're using sudo)
+
+0. Install OpenJDK JRE headless:
+```
+apt install openjdk-8-jre-headless
+```
+(If Java 8 is not available, you can install 11 instead)
+
+1. Create a system user:
+```
+groupadd spacebeans
+
+adduser --quiet \
+        --system \
+        --shell /usr/sbin/nologin \
+        --home /nonexistent \
+        --ingroup spacebeans \
+        --no-create-home \
+        --disabled-password \
+        spacebeans
+```
+
+2. Copy the server's binary to `/opt/spacebeans/`:
+```
+mkdir -p /opt/spacebeans
+cd /opt/spacebeans
+wget https://github.com/reidrac/spacebeans/releases/download/vVERSION/spacebeans-VERSION.jar
+```
+
+3. Create a certificate (optional, only if you don't have one already):
+```
+cd /opt/spacebeans
+keytool -genkey -keyalg RSA -alias ALIAS -keystore keystore.jks -storepass SECRET -noprompt -validity 36500 -keysize 2048
+chown spacebeans:spacebeans keystore.jks
+chmod 0400 keystore.jks
+```
+
+When entering the certificate details, use the domain name as `CN`.
+
+In the configuration file provide the path to the keystore, the alias and the
+secret used when generating the certificate.
+
+4. Prepare your `spacebeaans.conf` file.
+
+Put it in `/opt/spacebeans/`, with at least one virtual host.
+
+For example:
+```
+virtual-hosts = [
+    {
+        host = "*your domain*"
+        root = "/var/gemini/*your domain*"
+        index-file = "index.gmi"
+
+        directory-listing = true
+
+        key-store {
+            path = "/opt/spacebeans/keystore.jks"
+            alias = "*your domain*"
+            password = "*your secret*"
+        }
+    }
+]
+```
+
+Ensure that the file has the right permissions:
+```
+cd /opt/spacebeans
+chown spacebeans:spacebeans spacebeans.conf
+chmod 0400 spacebeans.conf
+```
+
+5. Create `/etc/systemd/system/spacebeans.service`:
+
+```
+[Unit]
+Description=SpaceBeans Gemini Server
+After=network.target
+
+[Service]
+Type=simple
+Restart=always
+RestartSec=5
+User=spacebeans
+ExecStart=/usr/bin/java -jar /opt/spacebeans/spacebeans-VERSION.jar -c /opt/spacebeans/spacebeans.conf
+
+[Install]
+WantedBy=multi-user.target
+```
+
+Then start the service:
+```
+systemctl start spacebeans.service
+```
+
+Check that it is up and running:
+```
+systemctl status spacebeans.service
+```
+
+(should say "Active: active (running)")
+
+Then enable it so it starts after a reboot:
+```
+systemctl enable spacebeans.service
+```
+
+And you're done!
+