aom: README.md: add note about recommended compilers

From 2921e645f9d62f8904504721dc355d45f3011398 Mon Sep 17 00:00:00 2001
From: James Zern <[EMAIL REDACTED]>
Date: Wed, 31 Jan 2024 16:51:05 -0800
Subject: [PATCH] README.md: add note about recommended compilers

Change-Id: Iefa5337c9216f6937f48b421017742a6e687316d
---
 README.md | 25 +++++++++++++++----------
 1 file changed, 15 insertions(+), 10 deletions(-)

diff --git a/README.md b/README.md
index 4e2eb2756c..97fb4402af 100644
--- a/README.md
+++ b/README.md
@@ -46,17 +46,22 @@ README.md                {#LREADME}
 
 ### Prerequisites {#prerequisites}
 
- 1. [CMake](https://cmake.org). See CMakeLists.txt for the minimum version
-    required.
- 2. [Git](https://git-scm.com/).
- 3. [Perl](https://www.perl.org/).
- 4. For x86 targets, [yasm](http://yasm.tortall.net/), which is preferred, or a
-    recent version of [nasm](http://www.nasm.us/). If you download yasm with
-    the intention to work with Visual Studio, please download win32.exe or
-    win64.exe and rename it into yasm.exe. DO NOT download or use vsyasm.exe.
- 5. Building the documentation requires
+1. [CMake](https://cmake.org). See CMakeLists.txt for the minimum version
+   required.
+2. [Git](https://git-scm.com/).
+3. A modern C compiler. gcc 6+, clang 7+, Microsoft Visual Studio 2019+ or
+   the latest version of MinGW-w64 (clang64 or ucrt toolchains) are
+   recommended. A C++ compiler is necessary to build the unit tests and some
+   features contained in the examples.
+4. [Perl](https://www.perl.org/).
+5. For x86 targets, [yasm](http://yasm.tortall.net/) or a recent version of
+   [nasm](http://www.nasm.us/). (If both yasm and nasm are present, yasm will
+   be used.) If you download yasm with the intention to work with Visual
+   Studio, please download win32.exe or win64.exe and rename it into yasm.exe.
+   DO NOT download or use vsyasm.exe.
+6. Building the documentation requires
    [doxygen version 1.8.10 or newer](http://doxygen.org).
- 6. Emscripten builds require the portable
+7. Emscripten builds require the portable
    [EMSDK](https://kripken.github.io/emscripten-site/index.html).
 
 ### Get the code {#get-the-code}