Added Router type

README.md

@@ -2,11 +2,22 @@
 
 HTTP router based on radix trees.
 
+## Example
+
+We can save any type of data inside the router. Here is an example storing strings for each route:
+
+```go
+router := router.New[string]()
+
+router.Add("GET", "/hello", "Hello")
+router.Add("GET", "/world", "World")
+```
+
 ## Benchmarks
 
-Loading and requesting every single route in [github.txt](testdata/github.txt):
+Requesting every single route in [github.txt](testdata/github.txt):
 
 ```
-BenchmarkLookup-12           	   50715	     23207 ns/op	   11649 B/op	     204 allocs/op
-BenchmarkLookupNoAlloc-12    	  148033	      7993 ns/op	       0 B/op	       0 allocs/op
+BenchmarkLookup-12           	   30147	     39105 ns/op	   19488 B/op	     337 allocs/op
+BenchmarkLookupNoAlloc-12    	   85166	     14411 ns/op	       0 B/op	       0 allocs/op
 ```