Added sops, updated readme, added main config

main/sops.nix

@@ -0,0 +1,22 @@
+{ config, lib, pkgs, ... }:
+
+{
+  sops = {
+    defaultSopsFile = ./secrets/secrets.yaml;
+    age = {
+      # This will automatically import SSH keys as age keys
+      sshKeyPaths = [
+        "/etc/ssh/ssh_host_ed25519_key"
+      ];
+      # This is using an age key that is expected to already be in the filesystem
+      keyFile = "/var/lib/sops-nix/key.txt";
+      # This will generate a new key if the key specified above does not exist
+      generateKey = true;
+      # This is the actual specification of the secrets.
+    };
+
+    secrets."user_password" = {
+      neededForUsers = true;
+    };
+  };
+}