Git for windows added

Initial creationg of Git using Chem xml file, very similar to maths

packages/git.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<packages>
+<package id="git" name="git" revision="%version%.2" priority="0" reboot="false">
+<variable name="version" value="2.24.0" />
+
+<check type="uninstall" path="Git version %version%" condition="exists" />
+
+<install cmd='%WPKGSOFTWARE%\git\git-%version%-64-bit.exe /sp- /verysilent /suppressmsgboxes /norestart' />
+
+<upgrade include='remove' />
+<upgrade include='install' />
+
+<remove cmd='"%programfiles%\git\unins000.exe" /verysilent /suppressmsgboxes /sp-'>
+  <exit code="-1"/>
+</remove>
+
+</package>
+</packages>