Create Win7.rst

Win7.rst

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+============
+Python 3.9.0 fork for Windows 7 support
+============
+
+A lot of people still use Windows 7. End date of ESU support - 2023-01-10.
+
+***************
+Build instructions:
+***************
+
+You need Visual Studio 2017 and Python 3.8. Switch off vcpkg if it's installed
+(vcpkg integrate remove). Install everything related to Python in Visual Studio Installer.
+
+ 1.  Start your "x64 Native Tools Command Prompt for VS 2017"
+ 2.  Change current directory to the place with enough free space.
+ 3.  pip install -U sphinx
+ 4.  set PYTHON="C:\\Program Files\\Python38\\python.exe"
+ 5.  set SPHINXBUILD="C:\\Program Files\\Python38\\Scripts\\sphinx-build.exe"
+ 6.  git clone https://github.com/NulAsh/cpython.git
+ 7.  cd cpython\\Tools\\msi
+ 8.  buildrelease.bat -x64
+ 9.  cd ..\\..\\PCbuild\\amd64\\en-us
+
+ And in this folder we can see installer python-3.9.0-amd64.exe, install it as usual.