Initial version of docs

docs/userguide/cmd_init.rst

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+.. _cmd_init:
+
+platformio init
+===============
+
+.. contents::
+
+Usage
+-----
+
+.. code-block:: bash
+
+    platformio init
+
+
+Description
+-----------
+
+Initialize new PlatformIO based project.
+
+
+This command will create:
+
+* ``.pioenvs`` - a temporary working directory.
+* ``lib`` - a directory for project specific libraries. PlatformIO will
+  compile them to static libraries and link to executable file
+* ``src`` - a source directory. Put your source code here.
+* :ref:`projectconf`
+
+
+Examples
+--------
+
+.. code-block:: bash
+
+    # Change directory to the future project
+    $ cd /path/to/empty/directory
+    $ platformio init
+    Project has been initialized!
+    Please put your source code to `src` directory, external libraries to `lib`
+    and setup environments in `platformio.ini` file.
+    Then process project with `platformio run` command.