[Keymap] add chriskopher keymap for usb-usb converter (#8856)

keyboards/converter/usb_usb/keymaps/chriskopher/rules.mk

@@ -0,0 +1,24 @@
+# Copyright 2020 Christopher Ko <chriskopher@gmail.com>
+#
+# 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/>.
+
+COMMAND_ENABLE = no # Not being used, and can cause conflicts with space cadet shifting
+SPACE_CADET_ENABLE = no # Not using special built in space cadet keys, using custom tap dance instead
+EXTRAKEY_ENABLE = yes # Used for audio control and system control keys
+COMBO_ENABLE = yes # Used to allow chording of keys to trigger an action
+TAP_DANCE_ENABLE = yes # Used to allow multiple taps of a key to perform different actions
+
+LINK_TIME_OPTIMIZATION_ENABLE = yes # Reduces the compiled firmware size
+
+SRC += combo.c tap_dance.c