Added benchmark to readme

Author: linkdotnet

README.md

@@ -31,6 +31,7 @@ The library works best for a small to medium amount of strings (not multiple 100
 A more detailed documentation can be found [here](https://linkdotnet.github.io/StringBuilder/).
 
 ## Benchmark
+
 The following table gives you a small comparison between the `StringBuilder` which is part of .NET and the `ValueStringBuilder`:
 
 ```no-class
@@ -40,4 +41,14 @@ The following table gives you a small comparison between the `StringBuilder` whi
 | ValueStringBuilder  | 226.7 ns | 2.45 ns | 2.05 ns | 0.1395 |     584 B |
 ```
 
+Another benchmark shows that this `ValueStringBuilder` uses less memory when it comes to appending `ValueTypes` such as `int`, `double`, ...
+
+```no-class
+|              Method |     Mean |    Error |   StdDev |  Gen 0 | Allocated |
+|-------------------- |---------:|---------:|---------:|-------:|----------:|
+| DotNetStringBuilder | 17.21 us | 0.622 us | 1.805 us | 1.5259 |      6 KB |
+|  ValueStringBuilder | 16.24 us | 0.496 us | 1.462 us | 0.3357 |      1 KB |
+
+```
+
 Checkout the [Benchmark](tests/LinkDotNet.StringBuilder.Benchmarks) for more detailed comparison and setup.