Improve README re initialization

README.md

@@ -6,12 +6,12 @@
 ## What It Does
 
 This library reads GPX files and provides an API for reading and manipulating
-the data as objects.  For more info on the GPX format, see
+the data as objects. For more info on the GPX format, see
 http://www.topografix.com/gpx.asp.
 
 In addition to parsing GPX files, this library is capable of converting
 Magellan NMEA files to GPX, converting GeoJSON data to GPX, and writing
-new GPX files.  It can crop and delete rectangular areas within a file,
+new GPX files. It can crop and delete rectangular areas within a file,
 and it also calculates some meta-data about the tracks and points in a file (such as distance, duration, average speed, etc).
 
 ## Requirements
@@ -20,12 +20,23 @@ and it also calculates some meta-data about the tracks and points in a file (suc
 - As of `1.0.0`, `gpx` requires at least Ruby 2.2 to run.
 
 ## Installation
+
 Add to your gemfile:
+
 ```
 gem 'gpx'
 ```
+
 ## Examples
 
+Initialize a `GPXFile` object with either a file-like object or a string representation:
+
+```ruby
+gpx = GPX::GPXFile.new(:gpx_file => string_io) # Anything that responds to `read`
+gpx = GPX::GPXFile.new(:gpx_file => path_to_a_file)
+gpx = GPX::GPXFile.new(:gpx_data => some_string)
+```
+
 Reading a GPX file, and cropping its contents to a given area:
 
 ```ruby
@@ -36,6 +47,7 @@ gpx.write(filename)                              # Save it
 ```
 
 Converting a Magellan track log to GPX:
+
 ```ruby
 if GPX::MagellanTrackLog::is_magellan_file?(filename)
  GPX::MagellanTrackLog::convert_to_gpx(filename, "#{filename}.gpx")
@@ -44,6 +56,7 @@ end
 
 Converting GeoJSON data to GPX can be achieved by providing a
 file path, file, or the data in string format:
+
 ```ruby
 # Converting from a file name
 gpx_file = GPX::GeoJSON.convert_to_gpx(geojson_file: 'mygeojsonfile.json')
@@ -67,6 +80,7 @@ gpx_file = GPX::GeoJSON.convert_to_gpx(
 ```
 
 Exporting an ActiveRecord to GPXFile (as Waypoints)
+
 ```ruby
 #
 # Our active record in this example is called stop
@@ -111,12 +125,11 @@ Mime::Type.register "application/gpx+xml", :gpx
 
 You have a complete example on how to create a gpx file from scratch on `tests/output_text.rb`.
 
-
 ## Notes
 
 This library was written to bridge the gap between my Garmin Geko
-and my website, WalkingBoss.org (RIP).  For that reason, it has always been more of a
-work-in-progress than an attempt at full GPX compliance.  The track side of the
+and my website, WalkingBoss.org (RIP). For that reason, it has always been more of a
+work-in-progress than an attempt at full GPX compliance. The track side of the
 library has seen much more use than the route/waypoint side, so if you're doing
 something with routes or waypoints, you may need to tweak some things.
 
@@ -126,7 +139,7 @@ working with tracks from several days or weeks.
 
 Finally, it should be noted that none of the distance/speed calculation or
 crop/delete code has been tested under International Date Line-crossing
-conditions.  That particular part of the code will likely be unreliable if
+conditions. That particular part of the code will likely be unreliable if
 you're zig-zagging across 180 degrees longitude routinely.
 
 ## License