Update readme and gitignore files. README has better usage examples and links to acks.

Author: v0dro

.gitignore

@@ -28,7 +28,7 @@ build/
 
 # for a library or gem, you might want to ignore these files since the code is
 # intended to run in multiple environments; otherwise, check them in:
-# Gemfile.lock
+Gemfile.lock
 # .ruby-version
 # .ruby-gemset
 

README.md

@@ -1,6 +1,46 @@
 # benchmark-plot
+
 A Ruby benchmark extension to allow comparative plotting of benchmarks.
 
+# Usage
+
+This gem is mainly useful for benchmarking code over a number of inputs. This input should be supplied in the form of an object capable of calling `#each`.
+
+Sample benchmarking script:
+
+``` ruby
+require 'benchmark/plot'
+
+class TestArray
+  attr_reader :arr
+
+  def initialize arr
+    @arr = arr
+  end
+
+  def to_s
+    @arr.size.to_s
+  end
+end
+
+test_data = [5, 25, 50, 75, 100, 125, 150, 175, 200,250,300]
+test_data.map! {|e| TestArray.new(Array.new(e) {|i| i}) }
+
+Benchmark.plot(test_data) do |x|
+  x.report("map.flatten") do |data|
+    data.arr.map { [nil]  }.flatten
+  end
+
+  x.report("flat_map") do |data|
+    data.arr.flat_map { [nil] }
+  end
+end
+```
+
+Output:
+
+![Benchmarks](examples/mapflat_vs_flat_map/benchmark_plot_graph.png)
+
 # Acknowledgements
 
-@tgxworld for providing the co-working space during the Open Source Breakfast Hack during Red Dot Ruby Conf 2016 where this gem was built.
+[@tgxworld](https://github.com/tgxworld) for providing the co-working space during the Open Source Breakfast Hack during Red Dot Ruby Conference 2016 where this gem was built.