Adding HistogramFactory. Updated RecorderExample

[LeeCampbell]

The new HistogramFactory class allow consumers to use a fluent syntax to construct a histogram or recorder instance. For example the code below creates a Recorder that wraps a LongConcurrentHistogram that will allow thread safe reads and write.

var recorder = HistogramFactory
                .With64BitBucketSize()                  //LongHistogram
                .WithValuesFrom(1)                      //Default value
                .WithValuesUpTo(TimeStamp.Minutes(10))  //Default value
                .WithPrecisionOf(3)                     //Default value
                .WithThreadSafeWrites()                 //Switches internal imp to concurrent version i.e. LongConcurrentHistogram
                .WithThreadSafeReads()                  //returns a Recorder that wraps the LongConcurrentHistogram
                .Create();

Closes #16
Targets #7 and HdrHistogram/HdrHistogram#58

[AppVeyorBot]

✅ Build HdrHistogram.NET 1.14.0-vkpejxcc completed (commit a931713f8e by @LeeCampbell)