What is the soccer stadium with the varsity name is citadins?
CREATE TABLE "r_seau_du_sport_tudiant_du_qu_bec" (
  "university" text,
  "varsity_name" text,
  "city" text,
  "province" text,
  "founded" real,
  "soccer_stadium" text,
  "stadium_capacity" real
);
SELECT "soccer_stadium" FROM "r_seau_du_sport_tudiant_du_qu_bec" WHERE "varsity_name"='Citadins';