Added initial docs, including a changelog

Docs initialized using this helpful guide:

http://docs.readthedocs.io/en/latest/getting_started.html

I used https://pypi.python.org/pypi/gitchangelog to kick-start the changelog.

Closes #99

Refs #109

docs/index.rst

@@ -0,0 +1,123 @@
+Datasette
+=========
+
+*An instant JSON API for your SQLite databases*
+
+Datasette provides an instant, read-only JSON API for any SQLite
+database. It also provides tools for packaging the database up as a
+Docker container and deploying that container to hosting providers such
+as `Zeit Now`_.
+
+Some examples: https://github.com/simonw/datasette/wiki/Datasettes
+
+Contents
+--------
+
+.. toctree::
+   :maxdepth: 2
+
+   changelog
+
+Getting started
+---------------
+
+::
+
+    pip3 install datasette
+
+Datasette requires Python 3.5 or higher.
+
+Basic usage
+-----------
+
+::
+
+    datasette serve path/to/database.db
+
+This will start a web server on port 8001 - visit http://localhost:8001/
+to access the web interface.
+
+``serve`` is the default subcommand, you can omit it if you like.
+
+Use Chrome on OS X? You can run datasette against your browser history
+like so:
+
+::
+
+     datasette ~/Library/Application\ Support/Google/Chrome/Default/History
+
+Now visiting http://localhost:8001/History/downloads will show you a web
+interface to browse your downloads data:
+
+.. figure:: https://static.simonwillison.net/static/2017/datasette-downloads.png
+   :alt: Downloads table rendered by datasette
+
+http://localhost:8001/History/downloads.json will return that data as
+JSON:
+
+::
+
+    {
+        "database": "History",
+        "columns": [
+            "id",
+            "current_path",
+            "target_path",
+            "start_time",
+            "received_bytes",
+            "total_bytes",
+            ...
+        ],
+        "table_rows": 576,
+        "rows": [
+            [
+                1,
+                "/Users/simonw/Downloads/DropboxInstaller.dmg",
+                "/Users/simonw/Downloads/DropboxInstaller.dmg",
+                13097290269022132,
+                626688,
+                0,
+                ...
+            ]
+        ]
+    }
+
+http://localhost:8001/History/downloads.jsono will return that data as
+JSON in a more convenient but less efficient format:
+
+::
+
+    {
+        ...
+        "rows": [
+            {
+                "start_time": 13097290269022132,
+                "interrupt_reason": 0,
+                "hash": "",
+                "id": 1,
+                "site_url": "",
+                "referrer": "https://www.dropbox.com/downloading?src=index",
+                ...
+            }
+        ]
+    }
+
+datasette serve options
+-----------------------
+
+::
+
+    $ datasette serve --help
+    Usage: datasette serve [OPTIONS] [FILES]...
+
+      Serve up specified SQLite database files with a web UI
+
+    Options:
+      -h, --host TEXT              host for server, defaults to 127.0.0.1
+      -p, --port INTEGER           port for server, defaults to 8001
+      --debug                      Enable debug mode - useful for development
+      --reload                     Automatically reload if code change detected -
+                                   useful for development
+      --cors                       Enable CORS by
+
+.. _Zeit Now: https://zeit.co/now