optimistic ui for message sending and submit state

src/store/submitSlice.js

@@ -0,0 +1,19 @@
+import { createSlice } from '@reduxjs/toolkit';
+
+const initialState = {
+  isSubmitting: false,
+};
+
+const currentSlice = createSlice({
+  name: 'submit',
+  initialState,
+  reducers: {
+    setSubmitState: (state, action) => {
+      state.isSubmitting = action.payload;
+    },
+  }
+});
+
+export const { setSubmitState } = currentSlice.actions;
+
+export default currentSlice.reducer;