VIA keymap for JJ4x4 and general cleanup (#8888)

keyboards/jj4x4/keymaps/via/keymap.c

@@ -0,0 +1,44 @@
+/* Copyright 2020
+ *
+ * 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
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+    LAYOUT_ortho_4x4(
+        KC_P7,   KC_P8,   KC_P9,   KC_PSLS,
+        KC_P4,   KC_P5,   KC_P6,   KC_PAST,
+        KC_P1,   KC_P2,   KC_P3,   KC_PMNS,
+        KC_P0,   KC_PDOT, KC_PPLS, LT(1, KC_ENT)
+    ),
+    LAYOUT_ortho_4x4(
+        RESET,   _______, _______, _______,
+        _______, _______, _______, _______,
+        _______, _______, _______, _______,
+        _______, _______, _______, _______
+    ),
+    LAYOUT_ortho_4x4(
+        _______, _______, _______, _______,
+        _______, _______, _______, _______,
+        _______, _______, _______, _______,
+        _______, _______, _______, _______
+    ),
+    LAYOUT_ortho_4x4(
+        _______, _______, _______, _______,
+        _______, _______, _______, _______,
+        _______, _______, _______, _______,
+        _______, _______, _______, _______
+    )
+};

keyboards/jj4x4/keymaps/via/rules.mk

@@ -0,0 +1,3 @@
+VIA_ENABLE = yes
+EXTRAKEY_ENABLE = no
+MOUSEKEY_ENABLE = no