feat: create theme slice

src/redux/theme/slice.ts

@@ -0,0 +1,17 @@
+import { createSlice } from '@reduxjs/toolkit'
+
+const initialState: 'light' | 'dark' = 'light'
+
+const themeSlice = createSlice({
+  name: 'theme',
+  initialState,
+  reducers: {
+    setTheme: (_, action) => {
+      return action.payload
+    },
+  },
+})
+
+export const { setTheme } = themeSlice.actions
+
+export default themeSlice.reducer