Update developer "getting started" docs (#1985)

* Add note about lack of support for vs2026 (for now)

* Add note about no official msvc 2026 support

* Add new Run configuration info for Qt Creator

Add extra info since we have some default test related run configurations possibly being populated as the default selection now, rather than a blank slate.

Author: Rainyan

CONTRIBUTING.md

@@ -31,6 +31,11 @@ See [README.md](README.md) in this repo for setting up your build environment (c
 To be safe and avoid problems with VAC, it's recommended to add a [-insecure](https://developer.valvesoftware.com/wiki/Command_Line_Options) launch flag before attaching your debugger.
 
 #### VS2022 + CMake (Windows)
+
+> [!NOTE]
+> We do *not* officially support Visual Studio 2026 at this time! If you run into issues, please consider downgrading to VS 2022 for now.
+> 
+
 In the CMake Target View, right-click "client (shared library)" and click on "Add Debug Configuration". This should generate the `src/.vs/launch.vs.json` config file.
 
 Modify the config to fix the directory paths; an example is provided below:
@@ -61,7 +66,13 @@ Modify the config to fix the directory paths; an example is provided below:
 ```
 
 #### Qt Creator (Linux)
-On the sidebar, click "Projects" then under your current kit, click "Run". Set the following:
+On the sidebar, click "Projects" then under your current kit, click "Run".
+
+By default, you may have one of the test configurations chosen as the currently active run configuration (`test_neo_crosshair`, etc).
+To create a new configuration, press "Add" and choose "Custom executable" (tested on Qt Creator 13.0.0, but the exact menus and wording
+may depend on your Qt Creator version).
+
+Once you have a fresh *Run configuration* created, set the following properties for it:
 
 | Property | Example value |
 | :---------------------------------- | :------------ |

README.md

@@ -14,6 +14,7 @@ To see the Table of Contents, please use the "Outline" feature on GitHub by clic
 
 * Windows: [Visual Studio 2022 (MSVC v143)](https://visualstudio.microsoft.com/downloads/)
     * Make sure to include C++ development environment, C++ MFC Library, Windows 10/11 SDK, and CMake during installation
+    * Please note that we do not currently officially support Visual Studio 2026
 * Linux: [Steam Runtime 3 "Sniper"](https://gitlab.steamos.cloud/steamrt/sniper/sdk)
     * GCC/G++ 10 toolchain
     * Compiled in the sniper's Docker/Podman/Toolbx container, schroot, or systemd-nspawn