[Doc] initial draft documentation README

includes local build documentation, style guide, contributing guide, doc license

Doc/README.md

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+# fontTools Documentation
+
+The fontTools project documentation updates continuously on Read the Docs as the project source changes.  
+
+The documentation can be found at **TODO - RTD URL when pushed and available**.
+
+## Contents
+
+- [How to Build Local Documentation](#how-to-build-local-documentation)
+- [Contributing to the fontTools Documentation](#contributing-to-the-documentation)
+- [Documentation License](#documentation-license)
+
+## How to Build Local Documentation
+
+### Install Dependencies
+
+You must have a Python 3 interpreter and the `pip` Python package manager installed on your system to build the fontTools documentation.  
+
+Use the following command to install the necessary Python build dependencies:
+
+```
+$ pip3 install sphinx sphinxcontrib-napoleon sphinx-rtd-theme
+```
+
+### Clone the fontTools repository
+
+Use the following command to clone the fontTools repository with `git`:
+
+```
+$ git clone https://github.com/fonttools/fonttools.git
+```
+
+### Build Documentation
+
+Navigate to the `Doc` directory of the fontTools repository.
+
+If `make` is installed on your system, execute the following command in the `Doc` directory:
+
+```
+$ make html
+```
+
+If `make` is not installed on your system, use the following command in the `Doc` directory:
+
+```
+$ sphinx-build -b html source build
+```
+
+Open the `Doc/build/html/index.html` file in your browser to view the home page of the documentation.
+
+## Contributing to the Documentation
+
+We highly encourage contributions!  Please follow the instructions below to improve the documentation.
+
+### Setup a fontTools Development Environment
+
+Please use the [installation instructions on the fontTools README](https://github.com/fonttools/fonttools/blob/master/README.rst#installation) to setup a development environment.  This will allow you to build and review local builds of documentation files before you submit your changes.
+
+### Python Docstring Style
+
+We recommend use of Python docstrings that follow [the Google Style Guide](https://github.com/google/styleguide/blob/gh-pages/pyguide.md#381-docstrings).  Our documentation build approach parses properly formatted docstrings into formatted documentation files.
+
+#### Function Documentation Example
+
+```python
+def fetch_bigtable_rows(big_table, keys, other_silly_variable=None):
+    """Fetches rows from a Bigtable.
+
+    Retrieves rows pertaining to the given keys from the Table instance
+    represented by big_table.  Silly things may happen if
+    other_silly_variable is not None.
+
+    Args:
+        big_table: An open Bigtable Table instance.
+        keys: A sequence of strings representing the key of each table row
+            to fetch.
+        other_silly_variable: Another optional variable, that has a much
+            longer name than the other args, and which does nothing.
+
+    Returns:
+        A dict mapping keys to the corresponding table row data
+        fetched. Each row is represented as a tuple of strings. For
+        example:
+
+        {'Serak': ('Rigel VII', 'Preparer'),
+         'Zim': ('Irk', 'Invader'),
+         'Lrrr': ('Omicron Persei 8', 'Emperor')}
+
+        If a key from the keys argument is missing from the dictionary,
+        then that row was not found in the table.
+
+    Raises:
+        IOError: An error occurred accessing the bigtable.Table object.
+    """
+```
+*Source: [Google Style Guide](https://github.com/google/styleguide/blob/gh-pages/pyguide.md) (CC BY-SA 3.0)*
+
+#### Class Documentation Example
+
+```python
+class SampleClass(object):
+    """Summary of class here.
+
+    Longer class information....
+    Longer class information....
+
+    Attributes:
+        likes_spam: A boolean indicating if we like SPAM or not.
+        eggs: An integer count of the eggs we have laid.
+    """
+
+    def __init__(self, likes_spam=False):
+        """Inits SampleClass with blah."""
+        self.likes_spam = likes_spam
+        self.eggs = 0
+
+    def public_method(self):
+        """Performs operation blah."""
+```
+*Source: [Google Style Guide](https://github.com/google/styleguide/blob/gh-pages/pyguide.md) (CC BY-SA 3.0)*
+
+### Build Local Documentation and Review Your Changes
+
+Please use the instructions above to build a local set of HTML documentation files with the Read the Docs theme and review your changes.
+
+### Submit a Pull Request
+
+Submit a Github pull request with your proposed improvements to the documentation.  
+
+Thanks for your contribution!
+
+## Documentation License
+
+The fontTools documentation is released under a [CC BY-SA 4.0 International License](https://creativecommons.org/licenses/by-sa/4.0/).