made the pack completely portable and wrote relevent bat files to go with it

gitportable/README.portable

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+README.portable
+=======================
+
+This version of Git for Windows is portable, i.e. does not need to
+be installed. It will run from any directory you place it in, even
+from a USB thumbdrive. It will not write permanent entries into the
+Windows registry. It does not need administrator privileges to "install".
+
+
+Installation
+------------
+
+This package is contained in a 7-zip archive with a file name of the form
+'PortableGit-<versionstring>.7z.exe'.  It is a self-extracting archive:
+you can (double-)click it and it will ask for the desired target directory
+(which defaults to C:\Program Files\Git). You may change that as needed or
+desired. Your user account needs write access to the selected directory.
+(You can move that directory with all its contents to a different place or
+computer at any time should you later desire so).
+
+*NOTE*: if you decide to unpack the archive using 7-Zip manually, you must
+run the `post-install.bat` script. Git will not run correctly
+otherwise.
+
+Functional differences to the non-portable Git for Windows
+----------------------------------------------------------
+
+This version does not offer you the convenient right-click context menu
+entries "Git GUI Here" and "Git Bash Here", because these would require
+to add entries into the Windows registry.
+
+
+Warning
+-------
+
+Since this portable package does not modify any Windows %path%
+variables, it is not possible to run the git.exe and gitk.exe files
+directly. Start the Git Bash or Git Cmd instead, or add the cmd/ folder
+to your %path%.
+
+
+How to start using PortableGit
+------------------------------
+
+If you are comfortable with a Unix-like shell, just launch 'git-bash.exe'.
+
+If not, just launch 'git-cmd.exe'.
+
+Alternatively, you can execute these commands to modify the %path%
+variable temporarily:
+
+        set gitdir=c:\portablegit
+        set path=%gitdir%\cmd;%path%
+
+Adjust the 'gitdir' according to your setup.  As long as you do not
+close the command window, you can now simply type "git" or "gitk" to
+really call "c:\portablegit\cmd\git.exe" or "c:\portablegit\cmd\gitk.exe".
+
+By default, git-cmd and git-bash use the directory they were started from as
+the working directory when run. You can override this by passing --cd-to-home
+to them, which will set the user's home directory as the working directory (as
+if Git for Windows was installed).
+
+In addition, if you set the HOME environment variable (either permanently or
+for the current session only) you can make Git store and  use the configuration
+files in the directory specified in that variable. And if you specify
+--cd-to-home, git-bash and git-cmd will use that as the working directory when
+launched, too. For example:
+
+        set HOME=%cd%/home
+        git --cd-to-home
+will use the relative directory named home (%cd% specifies the current
+directory).
+
+Quick start
+-----------
+
+Start configuring git with your personal settings:
+        git config --global user.name "Joe Sixpack"
+        git config --global user.email joe.sixpack@g_mail.com
+
+Start using git:
+        git --help
+
+
+How to change %path% permanently
+--------------------------------
+
+You may also want to make the modification to the %path% variable a
+permanent one. The %path% variable may be changed:
+
+* either on a System level (for all users in the lower pane), if you are
+  an Administrator
+* or for your own user account only (in the upper pane).
+
+To change the %path% variable permanently:
+
+* right-click "My Computer",
+* select "Properties",
+* open "Advanced",
+* click "Environment Variables",
+* highlight the "Path" variable,
+* click "Edit" (either in upper or in lower pane),
+* add your specific path to front of "Variable value" field, separated
+  by a semicolon from the existing entry.
+