Add layout English/Te Reo Māori.

[sslater11]

This is the EN MI layout requested by Sunset Sakura for the language Te Reo Māori which is used in New Zealand.
I used the ENThumbKey.kt and ENThumbKeySymbols.kt layouts and added these characters: ā ē ī ō ū Ā Ē Ī Ō Ū

Should be pretty easy to see the alterations I made using difftools

cd app/src/main/java/com/dessalines/thumbkey/keyboards/

vim -d ENThumbKey.kt ENMIThumbKey.kt
vim -d ENThumbKeySymbols.kt ENMIThumbKeySymbols.kt
or
meld ENThumbKey.kt ENMIThumbKey.kt
meld ENThumbKeySymbols.kt ENMIThumbKeySymbols.kt

[dessalines]

Thx!