created program option entries for all packages that needs continual state

modules/home-manager-modules/programs/obsidian.nix

@@ -0,0 +1,24 @@
+{
+  lib,
+  pkgs,
+  config,
+  osConfig,
+  ...
+}: {
+  options.programs.obsidian = {
+    # enable = lib.mkEnableOption "enable obsidian";
+  };
+
+  config = lib.mkIf config.programs.obsidian.enable (lib.mkMerge [
+    {
+      home.packages = with pkgs; [
+        obsidian
+      ];
+    }
+    (
+      lib.mkIf osConfig.host.impermanence.enable {
+        # TODO: map impermanence for obsidian
+      }
+    )
+  ]);
+}