add materials about swift (#4106)
* add materials about swift * fix spaces * add new material * fix build * fix build * fix build * fix
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@@ -57,7 +57,7 @@
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### Information security
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* [ångstromCTF](https://angstromctf.com)
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* [CTFtime](https://ctftime.org)
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* [CTFtime](https://ctftime.org)
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### Problem Sets
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