chore: add ui package and custom theme colors

packages/ui/src/theme.ts

@@ -0,0 +1,11 @@
+import { createTheme } from "@mantine/core";
+import { primaryColor } from "./theme/colors/primary";
+import { secondaryColor } from "./theme/colors/secondary";
+
+export const theme = createTheme({
+    colors: {
+      primaryColor,
+      secondaryColor,
+    },
+    primaryColor: "primaryColor",
+  });