[Keyboard] Adding support for Gergo (#4792)

* Commited into clean repo

* Gergo initial release

* Cleaning up

* Cleaning up

* Update readme.md

* Updated image, fixed MD formatting, added clairity

* Moved keymap to keyboard subdir, modified rules.mk

* Cleaned header guards

* Cleaned header guards. Read the rest of the PR comments

* Update keyboards/gergo/keymaps/default/keymap.c

Co-Authored-By: germ <jeremythegeek@gmail.com>

* Update keyboards/gergo/readme.md

Co-Authored-By: germ <jeremythegeek@gmail.com>

* Moved makefiles to keymap mod-area-thingy-with-overrides

* Update rules.mk

Slow the roll on the defaults while I wait for merge

* Update rules.mk

* Cleaning cleaning cleaning

* More housekeeping. Keeping optdefs

* moved keyboard specfic conf to config.h. Can we merge yet?

* added info.json

keyboards/gergo/gergo.h

@@ -0,0 +1,58 @@
+#pragma once
+#include <util/delay.h>
+#include <stdint.h>
+#include <stdbool.h>
+#include "quantum.h"
+#include "i2c_master.h"
+#include "matrix.h"
+
+
+extern i2c_status_t mcp23018_status;
+#define ERGODOX_EZ_I2C_TIMEOUT 1000
+#define CPU_PRESCALE(n) (CLKPR = 0x80, CLKPR = (n))
+#define CPU_16MHz       0x00
+
+// I2C aliases and register addresses (see "mcp23018.md")
+//#define I2C_ADDR        0b0100000
+#define I2C_ADDR        0x20
+#define I2C_ADDR_WRITE  ( (I2C_ADDR<<1) | I2C_WRITE )
+#define I2C_ADDR_READ   ( (I2C_ADDR<<1) | I2C_READ  )
+#define IODIRA          0x00            // i/o direction register
+#define IODIRB          0x01
+#define GPPUA           0x0C            // GPIO pull-up resistor register
+#define GPPUB           0x0D
+#define GPIOA           0x12            // general purpose i/o port register (write modifies OLAT)
+#define GPIOB           0x13
+#define OLATA           0x14            // output latch register
+#define OLATB           0x15
+
+void init_ergodox(void);
+uint8_t init_mcp23018(void);
+
+/*  ---------- LEFT HAND -----------   ---------- RIGHT HAND ---------- */
+#define LAYOUT_GERGO(                                                    \
+    L00,L01,L02,L03,L04,L05,                   R00,R01,R02,R03,R04,R05,  \
+    L10,L11,L12,L13,L14,L15,L16,           R10,R11,R12,R13,R14,R15,R16,  \
+    L20,L21,L22,L23,L24,L25,L26,           R20,R21,R22,R23,R24,R25,R26,  \
+                L31,L32,                           R33,R34,              \
+                            L30,           R30,                          \
+                        L33,L34,           R31,R32)                      \
+                                                                         \
+   /* matrix positions */                                                \
+    {                               \
+    { KC_NO, L16,   L26,  L30},     \
+    { L05,   L15,   L25,  L34},     \
+    { L04,   L14,   L24,  L33},     \
+    { L03,   L13,   L23,  L32},     \
+    { L02,   L12,   L22,  L31},     \
+    { L01,   L11,   L21,  KC_NO},   \
+    { L00,   L10,   L20,  KC_NO},   \
+                                    \
+    { R10,   KC_NO, R20, R30},      \
+    { R00,   R11,   R21, R31},      \
+    { R01,   R12,   R22, R32},      \
+    { R02,   R13,   R23, R33},      \
+    { R03,   R14,   R24, R34},      \
+    { R04,   R15,   R25, KC_NO},    \
+    { R05,   R16,   R26, KC_NO},    \
+}