[Keymap] Personal ISO-ish keymap for HHKB (#6632)

* Personal ISO-ish keymap for HHKB

* Fix keymap image

keyboards/hhkb/keymaps/tobiasvl_iso/keymap.c

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+#include QMK_KEYBOARD_H
+
+#define SPACE_FN LT(1, KC_SPC)
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+
+    [0] = LAYOUT( //  default layer
+        KC_GESC, KC_1, KC_2, KC_3, KC_4, KC_5, KC_6, KC_7, KC_8,    KC_9,    KC_0,     KC_MINS, KC_EQL,  KC_RBRC, KC_GRV,
+        KC_TAB,  KC_Q, KC_W, KC_E, KC_R, KC_T, KC_Y, KC_U, KC_I,    KC_O,    KC_P,     KC_LBRC, KC_NUHS, KC_BSPC,
+        KC_LCTL, KC_A, KC_S, KC_D, KC_F, KC_G, KC_H, KC_J, KC_K,    KC_L,    KC_SCLN,  KC_QUOT,          KC_ENT,
+        KC_LSFT, KC_Z, KC_X, KC_C, KC_V, KC_B, KC_N, KC_M, KC_COMM, KC_DOT,  KC_SLSH,           KC_RSFT, KC_NUBS,
+        KC_LALT, KC_LGUI,              SPACE_FN,                    KC_RGUI, KC_RALT),
+
+    [1] = LAYOUT(
+        KC_GRV,  KC_F1,   KC_F2,   KC_F3,    KC_F4,   KC_F5,   KC_F6,   KC_F7,   KC_F8,   KC_F9,   KC_F10,  KC_F11,  KC_F12,  KC_INS,  KC_DEL,
+        KC_CAPS, KC_PGUP, KC_UP,   KC_PGDN,  _______, _______, _______, _______, _______, _______, _______, KC_HOME, _______, _______,
+        _______, KC_LEFT, KC_DOWN, KC_RIGHT, _______, _______, _______, _______, _______, _______, _______, KC_END,           _______,
+        _______, _______, _______, _______,  _______, _______, _______, _______, _______, _______, _______,          _______, _______,
+        _______, _______,                             _______,                            _______, _______)
+};

keyboards/hhkb/keymaps/tobiasvl_iso/readme.md

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+# tobiasvl's ISO layout for HHKB
+
+This is my attempt to adapt my regular 60% Norwegian ISO layout to the physical HHKB layout, on the Happy Hacking Keyboard Pro 2 keyboard with the alternate QMK-compatible Hasu controller.
+
+## Base layer
+
+![HHKB ISO](https://i.imgur.com/8n4Kixw.png)
+
+The following changes have been made from standard HHKB:
+
+* The ] and \ keys are swapped so they're in the ISO locations, but a row higher. Whether or not this is a good idea depends heavily on what specific language layout you're using, but it makes sense for Norwegian, I think.
+* The Fn key is replaced with the ISO key (ie. "non-US backslash"). It's gotta go somewhere!
+* The spacebar doubles as space when tapped and Fn when held (ie. SpaceFN). This is a personal preference, but my second and more traditional choice would probably be to replace right GUI/Super with Fn.
+* Grave Escape has been added (shift + Esc produces ~).
+
+## Function layer
+
+This is just how I personally prefer to set up my function layer, and doesn't have anything to do with ISO. You probably want to swap out this wholesale for your own function layer.
+
+* Navigation is moved: Arrow keys on WASD, Page Up and Page Down on QE, Home and End on the right (I have them to the left of the vertical Enter on ISO layouts).
+* Grave Escape has been added (Fn + Esc produces \`).
+* No media keys or anything. I don't use them.