Add key

README.md

@@ -43,6 +43,7 @@
 | issue [🔊](http://dict.youdao.com/dictvoice?audio=issue&type=1) | ✅ ['ɪʃuː] | ❌ [ˈaɪʃuː] |
 | Java [🔊](http://dict.youdao.com/dictvoice?audio=java&type=1) | ✅ ['dʒɑːvə] | ❌ ['dʒɑːvɑː] |
 | jpg(jpeg) [🔊](http://dict.youdao.com/dictvoice?audio=JPEG&type=1) | ✅ ['dʒeɪpeɡ] | ❌ [ˈdʒeɪˈpi:ˈdʒiː] |
+| key [🔊](http://dict.youdao.com/dictvoice?audio=key&type=2) | ✅  [kiː] | ❌ [kei] |
 | lambda [🔊](http://dict.youdao.com/dictvoice?audio=lambda&type=1) | ✅ [ˈlæmdə] | ❌ [ˈlɒŋmdɑ] |
 | linear [🔊](http://dict.youdao.com/dictvoice?audio=linear&type=1) | ✅ ['lɪnɪə] | ❌ ['laɪə] |
 | Linux [🔊](http://dict.youdao.com/dictvoice?audio=linux&type=2) | ✅ ['lɪnəks] | ❌ [ˈlɪnʌks; ˈlɪnjuːks] |