Add initial version of emacs documentation

docs/ide/emacs.rst

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+..  Copyright 2014-2015 Ivan Kravets <me@ikravets.com>
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+       http://www.apache.org/licenses/LICENSE-2.0
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+
+.. _ide_emacs:
+
+Emacs
+=====
+
+GNU Emacs is an extensible, customizable text editor - and more. At its core is
+an interpreter for Emacs Lisp, a dialect of the
+`Lisp programming language <http://en.wikipedia.org/wiki/Lisp_programming_language>`_
+with extensions to support text editing.
+
+
+This software can be used with:
+
+* all available :ref:`platforms`
+* all available :ref:`frameworks`
+
+Refer to the `Emacs Documentation <https://www.gnu.org/software/emacs/#Manuals>`_
+page for more detailed information.
+
+.. contents::
+
+Integration
+-----------
+
+PlatformIO-Mode
+^^^^^^^^^^^^^^^
+
+An Emacs minor mode has been written to facilitate building and uploading from within Emacs.
+It can be installed from the MELPA repository using ``M-x package-install``.
+See the MELPA `Getting Started <https://melpa.org/#/getting-started>`_ page for more information.
+
+Setup instructions for the minor mode can be found at the `Github page <https://github.com/ZachMassia/platformio-mode>`_.
+
+Code completion can optionally be provided by installing `irony-mode <https://github.com/Sarcasm/irony-mode>`_
+
+
+Project Generator
+^^^^^^^^^^^^^^^^^
+
+You can generate an Emacs compatible project using
+:option:`platformio init --ide` command. Please choose board type using
+:ref:`cmd_boards` command and run:
+
+.. code-block:: shell
+
+    platformio init --ide emacs --board %TYPE%
+    cmake .
+
+
+There are 4 predefined targets for building.
+
+* ``platformio_build``  - Build project without auto-uploading.     (``C-c i b``)
+* ``platformio_upload`` - Build and upload (if no errors).          (``C-c i u``)
+* ``platformio_clean``  - Clean compiled objects.                   (``C-c i c``)
+* ``platformio_update`` - Update installed platforms and libraries. (``C-C i d``)
+
+.. warning::
+    The libraries which are added, installed or used in the project
+    after generating process wont be reflected in IDE. To fix it you
+    need to reinitialize project using :ref:`cmd_init` (repeat it).