README_git: Delete file

This file is not used during Org packaging as a tar/zip archive or as
an ELPA package.  It is largely redondant with the main README.

README_git

@@ -1,55 +0,0 @@
-This is the Emacs Org project, an Emacs library for organizing your life.
-
-The homepage of Org is at https://orgmode.org
-
-This distribution contains:
-
-README_git
-    This file.
-
-README
-    The README file for the main distribution (zip and tar files).
-
-README_ELPA
-    The README file for the ELPA packages.
-
-README_contribute
-    Information about the git repository and how to contribute
-    to Org-mode development.
-
-README_maintainer
-    Information for the maintainer.
-
-COPYING
-    The GNU General Public License.
-
-Makefile
-    The makefile to compile and install Org.  For installation
-    instructions, see the manual or the more detailed procedure
-    on Worg: https://orgmode.org/worg/dev/org-build-system.html
-
-mk/
-    Files needed for building Org.
-
-lisp/
-    Directory with all the Emacs Lisp files that make up Org.
-
-doc/
-    The documentation files.  org.texi is the source of the
-    documentation, org.html and org.pdf are formatted versions of it.
-
-etc/
-    Files needed for the ODT exporter.
-
-contrib/
-    A directory with third-party additions for Org.  Some really cool
-    stuff is in there.
-
-testing/
-    Testing suite for Org.
-
-request-assign-future.txt
-    The form that contributors have to sign and get processed with the
-    FSF before contributed changes can be integrated into the Org
-    core.  All files in this distribution except the contrib/ directory
-    have copyright assigned to the FSF.