Add section about statically building Qt

README.md

@@ -14,7 +14,7 @@
 
 Open the `sln` and build.
 
-#### Deployment steps
+#### Deployment steps for shared library
 
 The example here is for deploying an x64 Release build, but other build work analogously.
 
@@ -27,6 +27,35 @@ Start a `x64 Native Tools Command Prompt for VS 2019`:
 > windeployqt --no-system-d3d-compiler ..\x64\Release\AdaptiveBrightness.exe
 ```
 
+#### Deployment steps for statically linked library
+
+Qt does not provide a statically built library, so this has to be built by hand. The Qt installer for Windows also installs the Qt sources which can be used to build the static library.
+
+The following batch script sets up the build environment for an x64 build:
+
+```batch
+REM Set up Microsoft Visual Studio 2017, where <arch> is amd64, x86, etc.
+CALL "C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\VC\Auxiliary\Build\vcvarsall.bat" amd64
+SET _ROOT=%QTDIR%Src_x64
+SET PATH=%_ROOT%\qtbase\bin;%_ROOT%\gnuwin32\bin;%PATH%
+REM Uncomment the below line when using a git checkout of the source repository
+REM SET PATH=%_ROOT%\qtrepotools\bin;%PATH%
+SET _ROOT=
+```
+
+Then navigate to the source directory and configure the build system:
+
+```console
+> configure -opensource -confirm-license -nomake examples -nomake tests -static -static-runtime -debug-and-release -mp -prefix %QTDIR%\msvc2019_64_static
+```
+
+And build and install:
+
+```console
+> nmake
+> nmake install
+```
+
 ### Linux
 
 #### Prerequisites