benchmarks/string: Added README

Signed-off-by: Lucas Bajolet <r4pass@hotmail.com>

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+# Strings
+
+Strings are a building block of programming.
+Since they are that necessary, we must keep them as performing as possible.
+
+This series of benchmarks works on different structures for handling strings on the most common operations done on them.
+
+## Structures
+
+Some more structures are susceptible to be added as the project advances.
+At the moment, what is available consists of
+
+* Flat strings
+* Flat buffers
+* Rope strings
+* Rope buffers
+
+A String is defined as an immutable string.
+A Buffer is defined as a mutable string.
+
+Flat strings are arrays of characters, the most basic implementation of a string.
+Ropes are a tree-like structure where strings are bound through concatenation nodes.
+
+## Tests
+
+`concat`: Benches the concatenation speed of strings and buffers.
+
+`iter`: Benches the time of iteration of a string, through iterators or indexed access
+
+`substr`: Benches the time required to produce a substring.
+
+`arraytos`: Special bench, it measures the speed of `Array::to_s` through the use of various strategies.
+
+## Usage
+
+To pass a series of benches you can use the `make` command to bench all the aforementioned tests with default values.
+
+Each bench will be executed 5 times and the mean time will be represented in the final graph.
+
+The alternative is to use `bench_strings.sh` with custom arguments to it.
+For more information on the arguments and the format, execute it with the -h option for help.