add create a problem.

src/shared/api.ts

@@ -1,5 +1,5 @@
 import http from "utils/http"
-import { Profile } from "~/utils/types"
+import { Profile, Tag } from "~/utils/types"
 
 export function login(data: { username: string; password: string }) {
   return http.post("login", data)
@@ -12,3 +12,7 @@ export function logout() {
 export function getProfile(username: string = "") {
   return http.get<Profile>("profile", { params: { username } })
 }
+
+export function getProblemTagList() {
+  return http.get<Tag[]>("problem/tags")
+}