add magic tasks

Author: qdriven

tasks/features/magic/magic.md

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+# Magic Sub Command
+
+## Task 1: Please make flush-dns support windows
+
+please make flush-dns support windows
+- [ ] add a test case for flush-dns
+- [ ] add a test case for flush-dns on windows
+- [ ] add a test case for flush-dns on macos
+- [ ] add a test case for flush-dns on linux