Add gwt doctor to Quick Start section

- Include doctor command in README quick start
- Encourage users to check compatibility before first run

Co-authored-by: johndoe6345789 <224850594+johndoe6345789@users.noreply.github.com>

README.md

@@ -46,6 +46,9 @@ conan install . --output-folder=build --build=missing
 cmake --preset=default
 cmake --build build
 
+# Check system compatibility
+./build/gwt doctor
+
 # Run CLI
 ./build/gwt clone https://github.com/user/repo
 ./build/gwt workflows /path/to/repo

_codeql_detected_source_root

@@ -0,0 +1 @@
+.