feat(frontend): created theme object

services/frontend/src/utils/theme.tsx

@@ -0,0 +1,13 @@
+import { extendTheme } from "@mui/joy/styles";
+
+export const lightTheme = extendTheme({
+  colorSchemes: {
+    light: {
+      palette: {
+        primary: {
+          mainChannel: "#4f46e5"
+        }
+      }
+    }
+  }
+});