Add android gboard layout

layouts/gboard_en_us.txt

@@ -0,0 +1,5 @@
+[1][2][3][4][5][6][7][8][9][0]
+[q%][w\\][e|][r=][t\[][y\]][u<][i>][o{][p}]
+  [a@][s#][d$][f-][g&][h-][j+][k(][l)]
+|↑| [z*][x"][c'][v:][b;][n!][m?]
+|?123| [,] [ ] [.] |<-|