[Keyboard] Added IVY macropad (#6211)

* Added initial files for the Adron  3-key macro pad

* Refactor of "adron_pad" to "ivy", cleaned up the readme and removed un-needed keymap as well.

* Made suggested changes to commit for PR

* Removed unneeded define block from SUBPROJECT_rev1 as it is redundant (Thanks drashna ;) )

keyboards/ivy/keymaps/default/keymap.c

@@ -0,0 +1,46 @@
+#include QMK_KEYBOARD_H
+
+extern keymap_config_t keymap_config;
+
+// Each layer gets a name for readability, which is then used in the keymap matrix below.
+// The underscores don't mean anything - you can have a layer called STUFF or any other name.
+// Layer names don't all need to be of the same length, obviously, and you can also skip them
+// entirely and just use numbers.
+
+enum pad_layers {
+  _L1,
+  _FUNC
+};
+
+// Defines for task manager and such
+#define CALTDEL LCTL(LALT(KC_DEL))
+#define TSKMGR LCTL(LSFT(KC_ESC))
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+
+/* Layer 1
+ * ,------.
+ * |  1   |
+ * |------|
+ * |  2   |
+ * |------|
+ * |  FN  |
+ * `------'
+ */
+[_L1] = LAYOUT( \
+    KC_1, \
+    KC_2, \
+    MO(_FUNC)  \
+),
+
+[_FUNC] = LAYOUT( \
+    CALTDEL, \
+    TSKMGR, \
+    _______ \
+)
+
+};
+
+void matrix_init_user(void) {
+
+}