Add personal keymap

Adds keymap with readme for m4-a.

keyboards/machine_industries/m4_a/keymaps/naut/keymap.c

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+// Copyright 2022 naut
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include QMK_KEYBOARD_H
+
+// Defines names for use in layer keycodes and the keymap
+enum layer_names {
+    _BASE
+};
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+    /* Base */
+    [_BASE] = LAYOUT(
+        KC_0,   KC_1,   KC_ENT,
+        KC_SPC
+    )
+};

keyboards/machine_industries/m4_a/keymaps/naut/readme.md

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+# naut's Rama Works M4-A Layout
+
+Coding layer
+![naut's M4-A keymap layer 0](https://i.imgur.com/cTQUHy9.jpg)
+
+Code in binary using this keymap.
+
+* Keymap Maintainer: [naut](https://github.com/nautxx)
+
+Make example for this keymap (after setting up your build environment):
+
+    make machine_industries/m4_a:naut
+
+Flashing example for this keyboard:
+
+    make machine_industries/m4_a:naut:flash
+
+See the [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) and the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information. Brand new to QMK? Start with our [Complete Newbs Guide](https://docs.qmk.fm/#/newbs).
+
+## Bootloader
+
+Enter the bootloader in 3 ways:
+
+* **Bootmagic reset**: Hold down the key at (0,0) in the matrix (usually the top left key or Escape) and plug in the keyboard
+* **Physical reset button**: Briefly press the button on the back of the PCB - some may have pads you must short instead
+* **Keycode in layout**: Press the key mapped to `RESET` if it is available