add core configuration

home-manager/modules/neovim/colorscheme.nix

@@ -0,0 +1,42 @@
+{...}: {
+  programs.nixvim = {
+    colorschemes.catppuccin = {
+      enable = true;
+      settings = {
+        flavour = "mocha";
+        background = {
+          light = "latte";
+          dark = "mocha";
+        };
+        transparent_background = true;
+        show_end_of_buffer = false;
+        term_colors = false;
+        dim_inactive.enabled = false;
+        no_italic = false;
+        no_bold = false;
+        styles = {
+          comments = ["italic"];
+          conditionals = ["italic"];
+          loops = null;
+          functions = null;
+          keywords = null;
+          strings = null;
+          variables = null;
+          numbers = null;
+          booleans = null;
+          properties = null;
+          types = null;
+          operators = null;
+        };
+        integrations = {
+          cmp = true;
+          gitsigns = true;
+          nvimtree = true;
+          telescope = true;
+          notify = false;
+          mini = false;
+        };
+      };
+    };
+  };
+}