Merge pull request #169 from sifive/documentation

Add initial documentation

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+Installing Freedom E SDK
+========================
+
+Supported Systems
+-----------------
+
+Freedom E SDK is supported on Linux, MacOS, and Windows.
+
+Linux support is officially provided to distributions we distribute
+builds of the RISC-V toolchain for. Currently, these distributions are
+
+- Ubuntu
+- CentOS
+
+We expect other Linux distributions to work as well, provided that the
+user can either run our provided toolchains on them or produce their own
+toolchain.
+
+Windows support is not directly provided by Freedom E SDK, but through
+our Integrated Development Environment, Freedom Studio.
+
+Prerequisites
+-------------
+
+To use this SDK, you will need the following software available on your machine:
+
+- GNU Make
+- Git
+- The RISC-V GNU Embedded Toolchain
+- RISC-V OpenOCD (for use with development board and FPGA targets)
+
+Install the RISC-V Toolchain and OpenOCD
+----------------------------------------
+
+The RISC-V GNU Toolchain and OpenOCD are available from `the SiFive Website <https://www.sifive.com/boards>`_.
+
+For OpenOCD and/or RISC-V GNU Toolchain, download the .tar.gz for your platform,
+and unpack it to your desired location. Then, set the ``RISCV_PATH`` and
+``RISCV_OPENOCD_PATH`` environment variables when using the tools:
+
+.. code-block:: bash
+
+   cp openocd-<date>-<platform>.tar.gz /my/desired/location/
+   cp riscv64-unknown-elf-gcc-<date>-<platform>.tar.gz /my/desired/location
+   cd /my/desired/location
+   tar -xvf openocd-<date>-<platform>.tar.gz
+   tar -xvf riscv64-unknown-elf-gcc-<date>-<platform>.tar.gz
+   export RISCV_OPENOCD_PATH=/my/desired/location/openocd
+   export RISCV_PATH=/my/desired/location/riscv64-unknown-elf-gcc-<date>-<version>
+
+Cloning the Repository
+----------------------
+
+This repository can be cloned by running the following commands:
+
+.. code-block:: bash
+
+   git clone --recursive https://github.com/sifive/freedom-e-sdk.git
+   cd freedom-e-sdk
+
+The ``--recursive`` option is required to clone the git submodules included in the
+repository. If at first you omit the ``--recursive`` option, you can achieve
+the same effect by updating submodules using the command:
+
+.. code-block:: bash
+
+   git submodule update --init --recursive
+
+Updating the SDK
+----------------
+
+If you'd like to update your SDK to the latest version:
+
+.. code-block:: bash
+
+   git pull origin master
+   git submodule update --init --recursive