Adding bdn9 keymap examples for company event (#5800)

* Adding bdn9 keymap examples for company event

* Simplify some code w/ tap_code16 [pr feedback]

- Also remove backslashes
- Remove xxx and ___ layer definitions
- Properly name enums
- Add newline after slack reaction

keyboards/keebio/bdn9/keymaps/vosechu-browser/keymap.c

@@ -0,0 +1,57 @@
+#include QMK_KEYBOARD_H
+
+// Macro keys for some apps
+#define SLACKUP LALT(LSFT(KC_UP))
+#define SLACKDN LALT(LSFT(KC_DOWN))
+#define RELOAD  LGUI(KC_R)
+
+enum custom_keycodes {
+  PAWFIVE = SAFE_RANGE
+};
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+  [0] = LAYOUT(
+    RESET  , PAWFIVE, RELOAD ,
+    SLACKUP, KC_UP  , KC_PGUP,
+    SLACKDN, KC_DOWN, KC_PGDN
+  ),
+};
+
+void keyboard_post_init_user(void) {
+    // Call the post init code.
+    rgblight_enable_noeeprom(); // enables Rgb, without saving settings
+    rgblight_mode_noeeprom(RGBLIGHT_MODE_RAINBOW_SWIRL); // sets mode to Slow breathing without saving
+}
+
+bool process_record_user(uint16_t keycode, keyrecord_t *record) {
+  switch (keycode) {
+    case PAWFIVE:
+      if (record->event.pressed) {
+        SEND_STRING("+:pawfive:\n");
+        return false;
+      }
+  }
+
+  return true;
+}
+
+void encoder_update_user(uint8_t index, bool clockwise) {
+  if (index == 0) {
+    if (clockwise) {
+      // Tab right
+      tap_code16(LSFT(LGUI(KC_RBRC)));
+    } else {
+      // Tab left
+      tap_code16(LSFT(LGUI(KC_LBRC)));
+    }
+  }
+  else if (index == 1) {
+    if (clockwise) {
+      // History forward
+      tap_code16(LGUI(KC_RBRC));
+    } else {
+      // History back
+      tap_code16(LGUI(KC_LBRC));
+    }
+  }
+}