Change README to org format

Move from markdown to org mode. Seems more appropriate. I hope github
supports all the syntax.

README.md

@@ -1,3 +0,0 @@
-# ob-tmux.el
-
-An ob-screen.el inspired export block for org mode and tmux.

README.org

@@ -0,0 +1,93 @@
+* ob-tmux
+Ob-tmux is an Emacs library that allows org mode to evaluate code
+blocks in a tmux session.
+* Installation
+Unfortunately, ob-tmux has not yet been added to melpa. You will need
+to copy the ~ob-tmux.el~ file to a directory in your ~load-path~.
+** Configuration
+In your ~.emacs~ or ~.emacs.d/init.el~ file, add the following:
+#+BEGIN_SRC elisp
+  (require 'ob-tmux)
+  (setq org-babel-default-header-args:tmux
+    '((:results . "silent")		;
+      (:session . "default")	; The default tmux session to send code to
+      ;; You can use xterm or gnome terminal
+      (:terminal . "gnome-terminal")))
+
+  ;; The tmux sessions are prefixed with the following string.
+  ;; You can customize this if you like.
+  (setq org-babel-tmux-session-prefix "org-babel-session-")
+
+  ;; Finally, if you tmux is not in your $PATH for whatever reason, you
+  ;; may set the path to the tmux binary as follows:
+  (setq org-babel-tmux-location "/usr/bin/tmux")
+#+END_SRC
+* Usage
+You can start a new terminal window with a tmux session as follows:
+: #+BEGIN_SRC tmux :session hello
+: echo hello
+: #+END_SRC
+If you press =C-c C-c= with your point in the code block, a new
+terminal window will pop up with a new tmux session named
+=org-babel-session-hello=.
+
+You can continue work in this session with another code block.
+: #+BEGIN_SRC tmux :session hello
+: echo world
+: #+END_SRC
+If you press =C-c C-c= now, no new terminal window will open, but the
+code will be sent to the existing tmux session.
+
+You can open new windows within the existing session using the
+familiar tmux syntax.
+: #+BEGIN_SRC tmux :session hello:new-window
+: echo hello world in new-window
+: #+END_SRC
+Executing this code block will add a window, ~new-window~, to your
+session.
+
+You can exit your tmux session by detaching. The terminal window will
+close automatically. Ob-tmux will not detect that you have
+detached. Any commands you send will be sent in the background. You
+can reattach to your tmux session at any time and check that the
+commands have indeed been executed.
+
+Ob-tmux is useful for keeping notes on how to install software
+or perform tasks in the terminal, especially when some interactivity
+is required. It is also very useful for starting up your tmux
+sessions after a reboot. Take a Look at the following snippet.
+
+: ** Startup tmux
+: Use ~C-c C-v s~ to execute subtree.
+: *** Jupyter
+: #+BEGIN_SRC tmux :session daemons:jupyter
+: cd ~/projects/notebooks/
+: jupyter notebook
+: #+END_SRC
+: *** htop
+: #+BEGIN_SRC tmux session daemons:htop
+: htop
+: #+END_SRC
+: *** dmesg
+: #+BEGIN_SRC tmux :session daemons:dmesg
+: dmesg
+: #+END_SRC
+
+If your point is on the =Startup tmux= header, you can execute all
+code blocks in the subtree with ~C-c C-v s~ to jump start your tmux
+sessions.
+
+* Known bugs and or possible issues
+My tmux indexes start at 1. By default, tmux window indexes start at
+zero. This might lead to problems. I have not yet checked.
+
+Terminals other than xterm and gnome-terminal have not been
+checked. If you have positive or negative experiences with any other
+terminal, let me know.
+
+I will try to respond within a week to any issues raised. I cannot
+promise I will fix them.
+* Contributions
+Contributions are always welcome. Please be in touch before you make
+sweeping changes or add large features. This may prevent
+disappointment and will help me help you.