init /country route

src/pages/country/create.tsx

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+import {Box, TextField} from '@mui/material'
+import {Create} from '@refinedev/mui'
+import {useForm} from '@refinedev/react-hook-form'
+
+export const CountryCreate = () => {
+  const {
+    saveButtonProps,
+    refineCore: {formLoading},
+    register,
+    formState: {errors},
+  } = useForm({})
+
+  return (
+    <Create isLoading={formLoading} saveButtonProps={saveButtonProps}>
+      <Box component="form" sx={{display: 'flex', flexDirection: 'column'}} autoComplete="off">
+        <TextField
+          {...register('code', {
+            required: 'This field is required',
+          })}
+          error={!!(errors as any)?.title}
+          helperText={(errors as any)?.title?.message}
+          margin="normal"
+          fullWidth
+          InputLabelProps={{shrink: true}}
+          type="text"
+          label={'Code'}
+          name="code"
+        />
+        <TextField
+          {...register('name', {
+            required: 'This field is required',
+          })}
+          error={!!(errors as any)?.title}
+          helperText={(errors as any)?.title?.message}
+          margin="normal"
+          fullWidth
+          InputLabelProps={{shrink: true}}
+          type="text"
+          label={'Name'}
+          name="name"
+        />
+      </Box>
+    </Create>
+  )
+}

src/pages/country/edit.tsx

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+import {Box, TextField} from '@mui/material'
+import {Edit} from '@refinedev/mui'
+import {useForm} from '@refinedev/react-hook-form'
+
+export const CountryEdit = () => {
+  const {
+    saveButtonProps,
+    register,
+    formState: {errors},
+  } = useForm({})
+
+  return (
+    <Edit saveButtonProps={saveButtonProps}>
+      <Box component="form" sx={{display: 'flex', flexDirection: 'column'}} autoComplete="off">
+        <TextField
+          {...register('code', {
+            required: 'This field is required',
+          })}
+          error={!!(errors as any)?.title}
+          helperText={(errors as any)?.title?.message}
+          margin="normal"
+          fullWidth
+          InputLabelProps={{shrink: true}}
+          type="text"
+          label={'Code'}
+          name="code"
+        />
+        <TextField
+          {...register('name', {
+            required: 'This field is required',
+          })}
+          error={!!(errors as any)?.title}
+          helperText={(errors as any)?.title?.message}
+          margin="normal"
+          fullWidth
+          InputLabelProps={{shrink: true}}
+          type="text"
+          label={'Name'}
+          name="name"
+        />
+      </Box>
+    </Edit>
+  )
+}

src/pages/country/index.ts

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+export * from './create'
+export * from './edit'
+export * from './list'

src/pages/country/list.tsx

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+import {DataGrid, type GridColDef} from '@mui/x-data-grid'
+import {DeleteButton, EditButton, List, useDataGrid} from '@refinedev/mui'
+import React from 'react'
+
+export const CountryList = () => {
+  const {dataGridProps} = useDataGrid({})
+
+  const columns = React.useMemo<GridColDef[]>(
+    () => [
+      {
+        field: 'code',
+        headerName: 'Code',
+        type: 'string',
+        minWidth: 100,
+        display: 'flex',
+        align: 'left',
+        headerAlign: 'left',
+      },
+      {
+        field: 'name',
+        headerName: 'Name',
+        type: 'string',
+        minWidth: 100,
+        flex: 1,
+      },
+      {
+        field: 'actions',
+        headerName: 'Actions',
+        align: 'right',
+        headerAlign: 'center',
+        minWidth: 100,
+        sortable: false,
+        display: 'flex',
+        renderCell: function render({row}) {
+          return (
+            <>
+              <EditButton hideText recordItemId={row.name} />
+              <DeleteButton hideText recordItemId={row.name} />
+            </>
+          )
+        },
+      },
+    ],
+    [],
+  )
+
+  return (
+    <List>
+      <DataGrid {...dataGridProps} columns={columns} getRowId={(row: any) => row.code} />
+    </List>
+  )
+}