Add "Nano R4" category

This is the dedicated product category for the new Arduino Nano R4 board.

Author: per1234

content/categories/official-hardware/nano-family/nano-r4/README.md

@@ -0,0 +1,11 @@
+# Nano R4
+
+## Permissions
+
+| Group    | See | Reply | Create |
+| -------- | --- | ----- | ------ |
+| everyone | ✓   | ✓     | ✓      |
+
+## Published At
+
+https://forum.arduino.cc/c/official-hardware/nano-family/nano-r4/221

content/categories/official-hardware/nano-family/nano-r4/_pins.md

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+- https://forum.arduino.cc/t/about-the-nano-r4-category/1397631
+- https://forum.arduino.cc/t/how-to-get-the-best-out-of-this-forum/1397632

content/categories/official-hardware/nano-family/nano-r4/_topics/about-the-nano-r4-category/1.md

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+**Nano R4** brings the power of an **Arm Cortex-M4** processor to the Nano board form factor
+
+Use this category for topics where the primary subject matter is the **Arduino Nano R4** board.
+
+The **Nano R4** is based on the **Renesas RA4M1** microcontroller.
+
+https://docs.arduino.cc/hardware/nano-r4/

content/categories/official-hardware/nano-family/nano-r4/_topics/about-the-nano-r4-category/README.md

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+# About the Nano R4 category
+
+## Published At
+
+https://forum.arduino.cc/t/about-the-nano-r4-category/1397631

content/categories/official-hardware/nano-family/nano-r4/_topics/how-to-get-the-best-out-of-this-forum

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+../../../../../_topics/how-to-get-the-best-out-of-this-forum

content/categories/order.md

@@ -70,6 +70,7 @@
     - Nano ESP32
     - Nano Every
     - Nano Matter
+    - Nano R4
     - Nano RP2040 Connect
     - Nano Motor Carrier
   - Nicla Family