feat(route): add AtCoder (#8825)

docs/programming.md

@@ -24,6 +24,50 @@ pageClass: routes
 
 > AlgoCasts 需要付费订阅，RSS 仅做更新提醒，不含付费内容.
 
+## AtCoder
+
+### Present Contests
+
+<Route author="nczitzk" example="/atcoder/contest/en/upcoming" path="/atcoder/contest/:language?/:status?" :paramsDesc="['语言，可选 `jp` 即日语 或 `en` 即英语，默认为英语', '状态，见下表，默认为 Recent Contests']">
+
+状态
+
+| Active Contests | Upcoming Contests | Recent Contests |
+| --------------- | ----------------- | --------------- |
+| active          | upcoming          | recent          |
+
+</Route>
+
+### Contests Archive
+
+<Route author="nczitzk" example="/atcoder/contest" path="/atcoder/contest/:language?/:rated?/:category?/:keyword?" :paramsDesc="['语言，可选 `jp` 即日语 或 `en` 即英语，默认为英语', 'Rated 对象，见下表，默认为全部', '分类，见下表，默认为全部', '关键字，默认为空']">
+
+Rated 对象
+
+| ABC Class (Rated for ~1999) | ARC Class (Rated for ~2799) | AGC Class (Rated for ~9999) |
+| --------------------------- | --------------------------- | --------------------------- |
+| 1                           | 2                           | 3                           |
+
+分类
+
+| All | AtCoder Typical Contest | PAST Archive | Unofficial(unrated) |
+| --- | ----------------------- | ------------ | ------------------- |
+| 0   | 6                       | 50           | 101                 |
+
+| JOI Archive | Sponsored Tournament | Sponsored Parallel(rated) |
+| ----------- | -------------------- | ------------------------- |
+| 200         | 1000                 | 1001                      |
+
+| Sponsored Parallel(unrated) | Optimization Contest |
+| --------------------------- | -------------------- |
+| 1002                        | 1200                 |
+
+</Route>
+
+### Posts
+
+<Route author="nczitzk" example="/atcoder/post" path="/atcoder/post/:language?/:keyword?" :paramsDesc="['语言，可选 `jp` 即日语 或 `en` 即英语，默认为英语', '关键字，默认为空']"/>
+
 ## cve.mitre.org
 
 ### 搜索结果