Resolve "Improve populate.py"

Closes #55 (closed)

client/src/actions/roles.ts

+import axios from 'axios'
+import { AppDispatch } from './../store'
+import Types from './types'
+
+export const getRoles = () => async (dispatch: AppDispatch) => {
+  await axios
+    .get('/misc/roles')
+    .then((res) => {
+      dispatch({
+        type: Types.SET_ROLES,
+        payload: res.data.items,
+      })
+    })
+    .catch((err) => console.log(err))
+}