[Keyboard] Acheron Athena support (#16818)

Co-authored-by: Drashna Jaelre <drashna@live.com>

keyboards/acheron/athena/beta/beta.c

@@ -0,0 +1,35 @@
+/* Copyright 2020 Gondolindrim
+ *
+ * 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 "beta.h"
+
+
+void board_init(void) {
+    setPinInput(B6);
+    setPinInput(B7);
+}
+
+bool led_update_kb(led_t led_state) {
+    bool res = led_update_user(led_state);
+    #ifdef CAPSLOCK_INDICATOR
+    if(res) {
+        writePin(LED_CAPS_LOCK_PIN, led_state.caps_lock);
+    }
+    #else
+    writePin(LED_CAPS_LOCK_PIN, 0);
+    #endif
+    return res;
+}