add changelog.md

2022-03-05 01:17:21 +08:00 · 2022-03-05 01:17:21 +08:00 · 0ef5b7886c
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+# ChangeLog
+
+### 2022-03-05
+
+- Add [Traits chapter](https://practice.rs/generics-traits/traits.html) and solutions