Add section about pymupdf-tq branch to README

README.org

@@ -8,6 +8,58 @@
 [[https://stable.melpa.org/#/pdf-tools][http://stable.melpa.org/packages/pdf-tools-badge.svg]]
 [[https://melpa.org/#/pdf-tools][http://melpa.org/packages/pdf-tools-badge.svg]] [[https://ci.appveyor.com/project/vedang/pdf-tools][https://ci.appveyor.com/api/projects/status/yqic2san0wi7o5v8/branch/master?svg=true]]
 
+** About this pymupdf-tq branch
+   In this branch an alternative pdf-tools server, which is [[https://pymupdf.readthedocs.io/en/latest/][PyMuPDF]] based and
+   accordingly written in python, is being developed. The goal for of this
+   branch is to 'lower the bar' for maintaining and extending pdf-tools. Now the
+   rather 'demanding' requirement of having a very good knowledge of the C
+   programming language for extending the pdf-tools server, now gets 'lowered'
+   to a requirement of merely having a very limited knowledge of the python
+   programming language. In combination with some moderate knowledge of Emacs
+   lisp for extending the client, this opens the possibility to quite
+   straightforwardly implement line and arrow annotation features. Additionally,
+   with slightly more effort, an ink/freehand annotation feature could be
+   implemented. Enthusiastic hackers, could add pdf-form support and, as some
+   users have requested, keyboard navigation/selection support (implementing a
+   cursor).
+
+   With the help of the more then excellent [[https://pymupdf.readthedocs.io/en/latest/][PyMuPDF documentation]], writing the
+   python code for these features should be quite straightforward. However
+   writing the elisp/client code could be tricky. But enthusiastic hackers can
+   always count on help from the community. A least the author of the initial
+   code for this backend (and the [[https://elpa.gnu.org/devel/sketch-mode.html][sketch-mode]] package and several other Emacs
+   packages), generously offers his full assistance.
+
+   If you would like to hack on pdf-tools/this backend, then a kinds of
+   development tips and comments can be found in [[../wiki/PyMuPDF-backend][the wiki section]].
+
+*** Usage
+   Install this branch using a Quelpa recipe. In Spacemacs I am using the
+   following line of code to install pdf-tools from this branch of the
+   repository:
+  #+begin_src emacs-lisp :tangle yes
+    (pdf-tools :location (recipe
+                      :fetcher github
+                      :repo "dalanicolai/pdf-tools"
+                      :branch "pymupdf-tq"
+                      :files ("lisp/*.el"
+                              "README"
+                              "pymupdf-tq-server/*.py"
+                              ("build" "Makefile")
+                              ("build" "server")
+                              (:exclude "lisp/tablist.el" "lisp/tablist-filter.el"))))
+  #+end_src 
+  You could also simply install the ~vimura.py~ file directly in your pdf-tools
+  directory, but I am not sure if all functions will work correctly (in
+  particular the search functionality, as I have made a small (temporary?)
+  change to ~pdf-isearch.el~)
+
+  Install the [[https://pypi.org/project/PyMuPDF/][PyMuPDF]], [[https://pypi.org/project/Pillow/][Pillow]] and [[https://pypi.org/project/pytz/][pytz]] python packages in your preferred python
+  environment. 
+
+  Finally after loading pdf-tools, select the vimura server via ~M-x
+  pdf-tools-toggle-server~.
+
 ** About this package
    PDF Tools is, among other things, a replacement of DocView for PDF
    files.  The key difference is that pages are not pre-rendered by