add tools that provided freely to develop project

Author: hathach

README.rst

@@ -241,6 +241,15 @@ Table Legend
 \[empty\] Unknown
 ========= =========================
 
+Development Tools
+=================
+
+The following tools are provided freely to support the development of the TinyUSB project:
+
+- `IAR Build Tools (CX) <https://iar.com>`_ Professional IDE and compiler for embedded development
+- `JetBrains CLion <https://www.jetbrains.com/clion/>`_ Cross-platform IDE for C and C++ development
+- `PVS-Studio <https://pvs-studio.com/en/pvs-studio/?utm_source=website&utm_medium=github&utm_campaign=open_source>`_ static analyzer for C, C++, C#, and Java code.
+
 
 .. |Build Status| image:: https://github.com/hathach/tinyusb/actions/workflows/build.yml/badge.svg
    :target: https://github.com/hathach/tinyusb/actions