Add incomplete add_remove_role test

tests/member.rs

@@ -0,0 +1,13 @@
+mod common;
+
+#[tokio::test]
+async fn add_remove_role() {
+    let mut bundle = common::setup().await;
+    let guild_id = &bundle.guild.id.to_string();
+    let role_id = &bundle.role.id.to_string();
+    let user_id = &bundle.user.object.id.to_string();
+    chorus::types::GuildMember::add_role(&mut bundle.user, guild_id, user_id, role_id).await;
+    chorus::types::GuildMember::remove_role(&mut bundle.user, guild_id, user_id, role_id).await;
+    // TODO: Implement /guilds/{guild_id}/members/{member_id}/ GET route.
+    common::teardown(bundle).await
+}