add plot to readme

readme.md

@@ -75,3 +75,5 @@ Time: 18.4405s, size: 10000000, capacity: 67108864, alpha: 0.149012
 Table: hashing by multiplication, double hashing, alpha: 0.75, s: 2
 Time: 15.5715s, size: 10000000, capacity: 16777216, alpha: 0.596046
 ```
+### Results ###
+![Barplot of the benchmark results](https://gitlab.fachschaften.org/wester/hashtable-open-addressing/-/raw/ad353c868e41e5bb9218b3e6638f6ae43d9e978c/plot/barplot.svg)