Update readme with v2 code sample

Author: holly-hacker

README.md

@@ -5,7 +5,32 @@ OppaiSharp is a C# port of [oppai-ng](//github.com/Francesco149/oppai-ng) by [Fr
 It is "licensed" under the Unlicense, so you're free to do whatever you want with it. But giving me or Francesco149 a bit of credit doesn't hurt, and I would appreciate it if you didn't claim it as your own :)
 
 ## Example usage
+v2:
+```cs
+//create a StreamReader for your beatmap
+byte[] data = new WebClient().DownloadData("https://osu.ppy.sh/osu/774965");
+var stream = new MemoryStream(data, false);
+var reader = new StreamReader(stream);
+
+//read a beatmap
+var beatmap = Beatmap.Read(reader);
+
+//calculate star ratings for HDDT
+Mods mods = Mods.Hidden | Mods.DoubleTime;
+var diff = new DiffCalc().Calc(beatmap, mods);
+Console.WriteLine(string.Format("Star rating: {0:F2} (aim stars: {1:F2}, speed stars: {2:F2})", 
+    diff.Total, diff.Aim, diff.Speed));
+
+//calculate the PP for a play on this map
+//the play has no misses or 50's, so we don't specify them
+var pp = new PPv2(new PPv2Parameters(beatmap, diff, c100: 8, mods: mods));
+
+Console.WriteLine(string.Format("Play is worth {0:F2}pp ({1:F2} aim pp, {2:F2} acc pp, {3:F2} speed pp) " +
+                                "and has an accuracy of {4:F2}%", 
+    pp.Total, pp.Aim, pp.Acc, pp.Speed, pp.ComputedAccuracy.Value() * 100));
+```
 
+v1 (old):
 ```cs
 //create a StreamReader for your beatmap
 byte[] data = new WebClient().DownloadData("https://osu.ppy.sh/osu/774965");
@@ -31,6 +56,7 @@ var pp = new PPv2(new PPv2Parameters {
     Count50 = 0,
     CountMiss = 0,
 });
-Console.WriteLine(string.Format("Play is worth {0:F2}pp ({1:F2} aim pp, {2:F2} acc pp, {3:F2} speed pp) and has an accuracy of {4:F2}", 
+Console.WriteLine(string.Format("Play is worth {0:F2}pp ({1:F2} aim pp, {2:F2} acc pp, {3:F2} speed pp) " +
+                                "and has an accuracy of {4:F2}%", 
     pp.Total, pp.Aim, pp.Acc, pp.Speed, pp.ComputedAccuracy.Value() * 100));
 ```