[Keymap] Add ollyhayes keymap (#16632)

users/ollyhayes/ollyhayes.h

@@ -0,0 +1,41 @@
+/* Copyright 2022 Olly Hayes (@ollyhayes)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include QMK_KEYBOARD_H
+
+enum layers {
+    BASE,
+    QWERTY,
+    GAMES,
+    NUM,
+    FUNCTIONS,
+    ARR,
+    PUNC,
+    DUBPUNC,
+    MEDIA,
+};
+
+enum custom_keycodes {
+  DOWN4 = SAFE_RANGE,
+  UP4,
+  NUM_SWITCH,
+  ALTTAB,
+  A_UMLAUT,
+  O_UMLAUT,
+  U_UMLAUT,
+};
+
+extern uint16_t key_presses;