add witch to default roles

client/src/config/defaultRoles.js

@@ -40,6 +40,11 @@ export const defaultRoles = [
         description: 'Each night, choose a player to protect from the Werewolves. This can be yourself. If the Werewolves ' +
             'target this person, they still survive to the following day.'
     },
+    {
+        role: 'Witch',
+        team: 'good',
+        description: 'You have two potions. One saves a player from the Werewolves, and one kills a player. You may use each of them once per game during the night.'
+    },
     {
         role: 'Parity Hunter',
         team: 'good',