Add search engines

README.md

 	- Wikipedia (w | <https://en.wikipedia.org/w/index.php?title=Special:Search&search=%s>)
 	- MDN (mdn | <https://developer.mozilla.org/search?q=%s>)
 	- Can I Use (ciu | <https://caniuse.com/?search=%s>)
+	- Arch Wiki (aw | <https://wiki.archlinux.org/index.php?title=Special:Search&search=%s>)
+	- Arch Man Pages (amp | <https://man.archlinux.org/search?q=%s>)
 - Shopping
 	- Amazon Canada (a | <https://www.amazon.ca/s?k=%s>)
 	- AliExpress (ali | <https://www.aliexpress.com/w/wholesale-search.html?SearchText=%s>)