added custom readme file

custom-add-ons.md

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+## Custom Add-ons for your Sovran Pro
+
+Add-ons are extra features you can have installed before your Sovran Pro is shipped to you. 
+
+There is Jitsi Meet that is available to be added on. Jitsi is a video conference software in which you send a web link to a video conference and anyone can join. 
+https://jitsi.org
+
+There is also Bitcoin Knots Node available to be added instead of the regular Bitcoin Node. Bitcoin Knots allows a special filter to block unwanted, unusable, erroneous, yet harmless data on the Bitcoin Block chain.
+
+https://bitcoinknots.org
+
+
+
+The code will be installed in the `custom.nix` file.
+
+
+The code for Jitsi Meet is as follows:
+
+```nix
+systemd.services.jitsi-videobridge-helper = {
+    
+    script = ''
+     
+     systemctl restart jitsi-videobridge2 jicofo jibri   
+     
+    '';
+
+    unitConfig = {
+      Type = "simple";
+      After = "btcpayserver.service";
+      Requires = "network-online.target";
+    };
+     
+    serviceConfig = {
+      RemainAfterExit = "yes";
+      Type = "oneshot";
+    };
+
+    wantedBy = [ "multi-user.target" ];
+  
+  };
+
+
+  services.jitsi-videobridge.config = {
+    videobridge = {
+      http-servers = {
+        private = {
+          port = 8090;   
+        };
+      };
+    };
+  };
+
+  services.jitsi-meet = {
+    enable = true;
+    hostName = "**CUSTOM_DOMAIN_NAME**";
+    config = {
+      enableWelcomePage = false;
+      prejoinPageEnabled = true;
+      defaultLang = "en";
+      liveStreamingEnabled = false;
+      fileRecordingsEnabled = true;
+      fileRecordingsServiceEnabled = true;
+      localRecording = {
+        enable = true;
+        notifyAllParticipants = true;
+      };
+    };
+      
+    interfaceConfig = {
+      SHOW_JITSI_WATERMARK = false;
+      SHOW_WATERMARK_FOR_GUESTS = false;
+    };
+  };
+
+
+  services.jitsi-meet.caddy.enable = true;
+  services.jitsi-meet.nginx.enable = false;
+  services.jitsi-videobridge.openFirewall = true;
+  services.jitsi-meet.jibri.enable = true;
+  services.jibri.config = {
+    recording = {
+      recordings-directory = "/run/media/Second_Drive/BTCEcoandBackup/Jitsi_Recordings";
+    };
+    
+
+    ffmpeg = {
+      resolution = "1280x720";
+      framerate = 30;
+      video-encode-preset = "ultrafast";
+      h264-constant-rate-factor = 40; 
+    
+    };
+  
+  };
+  
+  
+  services.jitsi-videobridge.nat.publicAddress = builtins.readFile /var/lib/secrets/external_ip;
+  services.jitsi-videobridge.nat.localAddress = builtins.readFile /var/lib/secrets/internal_ip;
+
+  services.cron = {
+	 enable = true;
+	 systemCronJobs = [
+    "*/15 * * * * root /run/current-system/sw/bin/bash /var/lib/internal_ip/internal_ip.sh"
+	 ];
+  };
+
+```
+
+
+The code for Bitcoin Knots is as follows:
+
+```nix
+services.bitcoind.package = pkgs.bitcoind-knots;
+
+```
+