[Keyboard] keyboards/anavi: Add ANAVI Macro Pad 2 (#11821)

ANAVI Macro Pad 2 is an open source mini mechanical keyboard with
2 keys and backlit. Powered by ATtiny 85 microcontroller and with
microUSB connector. Designed with KiCad.

Provides the following keymaps for ANAVI Macro Pad 2:

- Default (with a, b and combo to control the LEDs)
- Copy & paste
- Tap dance example with a, b and c
- Mute
- Volume
- Zoom
- Jitsi Meet

Co-authored-by: Drashna Jaelre <drashna@live.com>
Signed-off-by: Leon Anavi <leon@anavi.org>

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

keyboards/anavi/macropad2/macropad2.h

@@ -0,0 +1,35 @@
+/*
+Copyright 2021 Leon Anavi <leon@anavi.org>
+
+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/>.
+*/
+
+#pragma once
+
+#include "quantum.h"
+
+/* This a shortcut to help you visually see your layout.
+ *
+ * The first section contains all of the arguments representing the physical
+ * layout of the board and position of the keys.
+ *
+ * The second converts the arguments into a two-dimensional array which
+ * represents the switch matrix.
+ */
+#define LAYOUT( \
+	K01, K02 \
+) \
+{ \
+  { K01, K02 }, \
+}