[Keyboard] add itstleo9 (#21460)

Co-authored-by: jack <0x6a73@protonmail.com>

keyboards/handwired/itstleo9/info.json

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+{
+    "manufacturer": "Its TLeo",
+    "keyboard_name": "ItsTleo9",
+    "maintainer": "Its TLeo",
+    "diode_direction": "COL2ROW",
+    "features": {
+        "bootmagic": true,
+        "command": false,
+        "console": false,
+        "extrakey": true,
+        "mousekey": true,
+        "nkro": true
+    },
+    "url": "",
+    "usb": {
+        "device_version": "1.0.0",
+        "pid": "0x0001",
+        "vid": "0x4954"
+    },
+    "community_layouts": ["ortho_3x3"],
+    "layouts": {
+        "LAYOUT_ortho_3x3": {
+            "layout": [
+                { "matrix": [0, 0], "x": 0, "y": 0 },
+                { "matrix": [0, 1], "x": 1, "y": 0 },
+                { "matrix": [0, 2], "x": 2, "y": 0 },
+                { "matrix": [1, 0], "x": 0, "y": 1 },
+                { "matrix": [1, 1], "x": 1, "y": 1 },
+                { "matrix": [1, 2], "x": 2, "y": 1 },
+                { "matrix": [2, 0], "x": 0, "y": 2 },
+                { "matrix": [2, 1], "x": 1, "y": 2 },
+                { "matrix": [2, 2], "x": 2, "y": 2 }
+            ]
+        }
+    }
+}

keyboards/handwired/itstleo9/keymaps/default/keymap.c

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+// Copyright 2023 QMK
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include QMK_KEYBOARD_H
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+    /*
+     * ┌───┬───┬───┐
+     * │ A │ B │ C │
+     * ├───┼───┼───┤
+     * │ D │ E │ F │
+     * ├───┼───┼───┤
+     * │ G │ H │ I │
+     * └───┴───┴───┘
+     */
+    [0] = LAYOUT_ortho_3x3(
+        KC_A,    KC_B,    KC_C,
+        KC_D,    KC_E,    KC_F,
+        KC_G,    KC_H,    KC_I
+    )
+};

keyboards/handwired/itstleo9/keymaps/via/keymap.c

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+// Copyright 2023 QMK
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include QMK_KEYBOARD_H
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+    /*
+     * ┌───┬───┬───┐
+     * │ A │ B │ C │
+     * ├───┼───┼───┤
+     * │ D │ E │ F │
+     * ├───┼───┼───┤
+     * │ G │ H │ I │
+     * └───┴───┴───┘
+     */
+    [0] = LAYOUT_ortho_3x3(
+        KC_A,    KC_B,    KC_C,
+        KC_D,    KC_E,    KC_F,
+        KC_G,    KC_H,    KC_I
+    )
+};

keyboards/handwired/itstleo9/keymaps/via/rules.mk

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+VIA_ENABLE = yes

keyboards/handwired/itstleo9/promicro/info.json

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+{
+    "development_board": "promicro",
+    "matrix_pins": {
+        "cols": ["D1", "D0", "D4"],
+        "rows": ["F4", "F5", "F6"]
+    }
+}

keyboards/handwired/itstleo9/promicro/rules.mk

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+# This file intentionally left blank

keyboards/handwired/itstleo9/readme.md

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+# itstleo9
+
+Handwired 3x3 macropad built with Pro Micro compatible microcontrollers
+
+* Keyboard Maintainer: [ItsTLeo](https://github.com/ItsTLeo)
+* Hardware Supported: RP2040/ATmega32U4 Pro Micro
+* Hardware Availability: [RP2040](https://aliexpress.com/item/1005005616524430.html), [ATmega32U4](https://aliexpress.com/item/32888212119.html)
+
+Make example for this keyboard (after setting up your build environment):
+
+    make handwired/itstleo9/promicro:default
+    make handwired/itstleo9/rp2040:default
+    
+Flashing example for this keyboard:
+
+    make handwired/itstleo9/promicro:default:flash
+    make handwired/itstleo9/rp2040:default: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). Dont know how to make a handwire keyboard, check it out [SkottoKeebs handwire tutorial](https://www.youtube.com/watch?v=hjml-K-pV4E&pp=ygUTaGFuZHdpcmUgYSBtYWNyb3BhZA%3D%3D)
+
+## Matrix pin (RP2040 ver)
+
+*    **cols** :     GP10  ,  GP11   ,  GP12
+*    **rows** :     GP21  ,  GP20   ,  GP19
+
+## Matrix pin (Promicro ver)
+
+*    **cols** :     D1  ,  D0   ,  D4
+*    **rows** :     F4  ,  F5   ,  F6
+
+## Bootloader
+
+Enter the bootloader in 3 ways:
+
+* **Bootmagic reset**: Hold down the key at (0,0) in the matrix (top left key) and plug in the keyboard
+* **Physical reset button**: Double-press reset button
+* **Keycode in layout**: Press the key mapped to `QK_BOOT` if it is available

keyboards/handwired/itstleo9/rp2040/info.json

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+{
+    "bootloader": "rp2040",
+    "processor": "RP2040",
+    
+    "matrix_pins": {
+        "cols": ["GP10", "GP11", "GP12"],
+        "rows": ["GP21", "GP20", "GP19"]
+    }
+}

keyboards/handwired/itstleo9/rp2040/rules.mk

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+# This file intentionally left blank