Added UPDATE and DELETE queries for user table

Author: seancfong

server/queries/users.sql

@@ -0,0 +1,13 @@
+-- PUT/:uid - Updates an existing user as approved
+UPDATE
+    users
+SET
+    approved = TRUE
+WHERE
+    id = ?;
+
+-- DELETE/:uid - Deletes an existing user given their id
+DELETE FROM
+    users
+WHERE
+    id = ?;